Add default light profile for PortMaster

docs/PORTMASTER.md

@@ -140,30 +140,52 @@ following in the installed game:
 - A single button never cancels auto-map.
 - Holding both bumpers together for 1.25 seconds cancels auto-map.
 
-## Low-end performance profile
+## PortMaster performance profile
 
-The launcher keeps the normal game profile on unknown and stronger hardware.
+Every PortMaster launch defaults to the light performance profile, regardless
-It enables the low-end profile only when the Linux device tree reports one of
+of device family. This reflects the low-end hardware that makes up most of the
-the identifiers used by Allwinner H616/H700 XX handhelds:
+PortMaster ecosystem and keeps the canonical package conservative by default.
 
-- `allwinner,h616`
+The light profile passes these Godot options:
-- `sun50iw9p1`
-- `allwinner,sun50i-h700`
-
-The low-end profile passes these Godot options:
 
 - `--single-window`
 - `--disable-vsync`
 - `--max-fps 30`
 - `--audio-output-latency 40`
 
-It also passes `NETFISHING_LOW_END=1`. The game renders the 3D world at 75%
+It also passes `NETFISHING_PERFORMANCE_PROFILE=light` and
-linear resolution with nearest-neighbor scaling, reducing 3D pixel work by
+`NETFISHING_LOW_END=1`. The game renders the 3D world at 50% linear resolution
-about 44% while the separately rendered UI retains its canonical resolution.
+with nearest-neighbor scaling, reducing 3D pixel work by 75% while the
+separately rendered UI retains its canonical resolution. The light profile
+also:
 
-Do not use Godot's low processor mode for this profile. It reduces idle CPU
+- disables the additional full-screen world-pixelation pass;
-usage by sleeping between updates and is not a game-performance optimization.
+- replaces animated depth-aware water shaders with opaque, per-vertex water;
+- disables ocean surface motion;
+- reduces rain to 256 particles simulated at 15 FPS; and
+- replaces procedural sky clouds and 81 moving local cloud patches with one
+  flat cloud ceiling.
 
-Before adding a device family, record its exact NUL-separated device-tree
+The normal profile retains the full visual presentation.
-`compatible` value from hardware. Do not infer detection from a retail product
+
-name alone.
+To opt a capable device into the normal profile, create the persistent file
+`netfishing/conf/performance_profile` containing exactly:
+
+```text
+normal
+```
+
+On a typical muOS installation, the full path is:
+
+```text
+/mnt/mmc/ports/netfishing/conf/performance_profile
+```
+
+Set the file to `light`, or remove it, to restore the default. An externally
+provided `NETFISHING_PERFORMANCE_PROFILE=normal` or `light` environment value
+takes precedence over the persistent file. Invalid values safely fall back to
+the light profile and are reported in `netfishing/log.txt`.
+
+Do not use Godot's low processor mode for the light profile. It reduces idle
+CPU usage by sleeping between updates and is not a game-performance
+optimization.

main/main.gd

@@ -39,6 +39,9 @@ const PixelationResetOverlayType = preload(
 const WorldPixelationPostprocessType = preload(
 	"res://main/world_pixelation_postprocess.gd"
 )
+const RuntimePerformanceProfileType = preload(
+	"res://main/runtime_performance_profile.gd"
+)
 const NetworkSessionType = preload("res://network/network_session.gd")
 const DiscoveryClientType = preload("res://network/discovery_client.gd")
 const DedicatedServerConfigType = preload(
@@ -235,6 +238,7 @@ var _data_folder_dialog: FileDialog
 var _data_folder_picker_generation: int = 0
 var _restore_data_setup_after_picker: bool = false
 var _application_initialized := false
+var _performance_profile: RuntimePerformanceProfileType
 var _pending_existing_root_path := ""
 var _local_recovery_attempt_id: String = ""
 var _dedicated_runtime: bool = false
@@ -244,10 +248,17 @@ var _rain_ambience: RainAmbienceType
 
 
 func _ready() -> void:
+	_performance_profile = RuntimePerformanceProfileType.from_environment()
 	_dedicated_runtime = _is_dedicated_server_runtime()
 	if _dedicated_runtime:
 		call_deferred("_start_dedicated_server")
 		return
+	_world_pixelation.set_light_performance_profile(
+		_performance_profile.is_light()
+	)
+	_test_world.set_light_performance_profile(
+		_performance_profile.is_light()
+	)
 	DisplayServer.window_set_title("NETfishing")
 	_rain_ambience = RainAmbienceType.new()
 	_rain_ambience.name = "RainAmbience"
@@ -441,6 +452,7 @@ func _initialize_application(dedicated: bool) -> void:
 			_world_weather,
 			_player,
 			Callable(_player, "get_active_gameplay_camera"),
+			_performance_profile.is_light(),
 		)
 		if not _world_time.natural_time_advanced.is_connected(
 			_on_natural_time_advanced
@@ -1324,9 +1336,7 @@ func _apply_world_pixelation(pixel_size: int) -> void:
 	var root_viewport: Viewport = get_viewport()
 	root_viewport.scaling_3d_mode = Viewport.SCALING_3D_MODE_NEAREST
 	root_viewport.scaling_3d_scale = (
-		0.75
+		_performance_profile.get_world_render_scale()
-		if OS.get_environment("NETFISHING_LOW_END") == "1"
-		else 1.0
 	)
 	root_viewport.msaa_3d = Viewport.MSAA_DISABLED
 	root_viewport.screen_space_aa = Viewport.SCREEN_SPACE_AA_DISABLED

main/runtime_performance_profile.gd

@@ -0,0 +1,50 @@
+class_name RuntimePerformanceProfile
+extends RefCounted
+
+const PROFILE_ENVIRONMENT_VARIABLE: String = (
+	"NETFISHING_PERFORMANCE_PROFILE"
+)
+const LEGACY_LIGHT_ENVIRONMENT_VARIABLE: String = "NETFISHING_LOW_END"
+const NORMAL_PROFILE: StringName = &"normal"
+const LIGHT_PROFILE: StringName = &"light"
+const NORMAL_WORLD_RENDER_SCALE: float = 1.0
+const LIGHT_WORLD_RENDER_SCALE: float = 0.5
+
+var _profile_name: StringName = NORMAL_PROFILE
+
+
+static func from_environment() -> RuntimePerformanceProfile:
+	return from_name(
+		StringName(OS.get_environment(PROFILE_ENVIRONMENT_VARIABLE)),
+		OS.get_environment(LEGACY_LIGHT_ENVIRONMENT_VARIABLE) == "1",
+	)
+
+
+static func from_name(
+	profile_name: StringName,
+	legacy_light_requested: bool = false,
+) -> RuntimePerformanceProfile:
+	var profile := RuntimePerformanceProfile.new()
+	if profile_name == LIGHT_PROFILE or (
+		profile_name.is_empty() and legacy_light_requested
+	):
+		profile._profile_name = LIGHT_PROFILE
+	else:
+		profile._profile_name = NORMAL_PROFILE
+	return profile
+
+
+func get_profile_name() -> StringName:
+	return _profile_name
+
+
+func is_light() -> bool:
+	return _profile_name == LIGHT_PROFILE
+
+
+func get_world_render_scale() -> float:
+	return (
+		LIGHT_WORLD_RENDER_SCALE
+		if is_light()
+		else NORMAL_WORLD_RENDER_SCALE
+	)

main/runtime_performance_profile.gd.uid

@@ -0,0 +1 @@
+uid://8vm104r2264h

main/world_pixelation_postprocess.gd

@@ -5,6 +5,7 @@ extends CanvasLayer
 
 var _pixel_size: int = PlayerSettings.DEFAULT_WORLD_PIXEL_SIZE
 var _gameplay_active: bool = false
+var _light_performance_profile: bool = false
 
 
 func _ready() -> void:
@@ -26,6 +27,15 @@ func set_gameplay_active(active: bool) -> void:
 	_refresh_grid()
 
 
+func set_light_performance_profile(enabled: bool) -> void:
+	_light_performance_profile = enabled
+	_refresh_grid()
+
+
+func is_light_performance_profile() -> bool:
+	return _light_performance_profile
+
+
 func get_grid_size() -> Vector2i:
 	return PlayerSettings.get_world_grid_size(
 		_pixel_size,
@@ -38,6 +48,7 @@ func _refresh_grid() -> void:
 		return
 	var effect_enabled: bool = (
 		_gameplay_active
+		and not _light_performance_profile
 		and _pixel_size != PlayerSettings.MIN_WORLD_PIXEL_SIZE
 	)
 	_screen_grid.visible = effect_enabled

scripts/build_portmaster.sh

@@ -140,7 +140,10 @@ The package requires an ARM64 device, two analog sticks, GLIBC 2.28 or newer,
 and the \`weston_pkg_0.2\` runtime.
 
 Save data and device-local configuration remain under \`netfishing/conf/\`.
-See \`netfishing/licenses/\` for bundled credits and license information.
+PortMaster launches use the light performance profile by default. Put the word
+\`normal\` in \`netfishing/conf/performance_profile\` to opt a capable device
+into the normal rendering profile. See \`netfishing/licenses/\` for bundled
+credits and license information.
 EOF
 
 (
@@ -162,6 +165,10 @@ grep -q '"version": 4' "${STAGE_ROOT}/port.json"
 grep -q '"name": "netfishing.zip"' "${STAGE_ROOT}/port.json"
 grep -q '^# PORTMASTER: netfishing.zip, NETfishing.sh$' \
   "${STAGE_ROOT}/NETfishing.sh"
+grep -Fq 'PROFILE_PATH="$CONFDIR/performance_profile"' \
+  "${STAGE_ROOT}/NETfishing.sh"
+grep -Fq 'NETFISHING_PERFORMANCE_PROFILE=light' \
+  "${STAGE_ROOT}/NETfishing.sh"
 if grep -q 'GPTOKEYB' "${STAGE_ROOT}/NETfishing.sh"; then
   echo "GPTOKEYB must not be enabled for NETfishing." >&2
   exit 1

scripts/portmaster/NETfishing.sh

@@ -78,17 +78,36 @@ fi
 
 NETFISHING_GODOT_OPTIONS=()
 NETFISHING_GAME_ENVIRONMENT=()
-DEVICE_COMPATIBILITY=""
+PERFORMANCE_PROFILE="${NETFISHING_PERFORMANCE_PROFILE:-}"
-if [[ -r /proc/device-tree/compatible ]]; then
+PROFILE_PATH="$CONFDIR/performance_profile"
-	DEVICE_COMPATIBILITY="$(tr '\0' ' ' </proc/device-tree/compatible)"
+if [[ -z "$PERFORMANCE_PROFILE" && -r "$PROFILE_PATH" ]]; then
-elif [[ -r /sys/firmware/devicetree/base/compatible ]]; then
+	IFS= read -r PERFORMANCE_PROFILE < "$PROFILE_PATH" || true
-	DEVICE_COMPATIBILITY="$(
+	PERFORMANCE_PROFILE="${PERFORMANCE_PROFILE%$'\r'}"
-		tr '\0' ' ' </sys/firmware/devicetree/base/compatible
-	)"
 fi
-case "$DEVICE_COMPATIBILITY" in
+case "$PERFORMANCE_PROFILE" in
-	*allwinner,h616*|*sun50iw9p1*|*allwinner,sun50i-h700*)
+	normal)
-		NETFISHING_GAME_ENVIRONMENT+=("NETFISHING_LOW_END=1")
+		NETFISHING_GAME_ENVIRONMENT+=(
+			"NETFISHING_PERFORMANCE_PROFILE=normal"
+		)
+		;;
+	light|"")
+		NETFISHING_GAME_ENVIRONMENT+=(
+			"NETFISHING_PERFORMANCE_PROFILE=light"
+			"NETFISHING_LOW_END=1"
+		)
+		NETFISHING_GODOT_OPTIONS+=(
+			--single-window
+			--disable-vsync
+			--max-fps 30
+			--audio-output-latency 40
+		)
+		;;
+	*)
+		echo "Unknown performance profile '$PERFORMANCE_PROFILE'; using light." >&2
+		NETFISHING_GAME_ENVIRONMENT+=(
+			"NETFISHING_PERFORMANCE_PROFILE=light"
+			"NETFISHING_LOW_END=1"
+		)
 		NETFISHING_GODOT_OPTIONS+=(
 			--single-window
 			--disable-vsync

scripts/run_validations.sh

@@ -30,6 +30,7 @@ readonly -a QUICK_TESTS=(
 
 readonly -a RUNTIME_TESTS=(
 	"tests/inventory_notepad_art_validation.gd"
+	"tests/light_performance_profile_validation.gd"
 	"tests/logbook_runtime_validation.gd"
 	"tests/player_experience_ui_validation.gd"
 	"tests/title_credits_validation.gd"

tests/controller_ui_navigation_validation.gd

@@ -61,8 +61,12 @@ func _validate_low_end_profile_contract() -> void:
 	var launcher: String = FileAccess.get_file_as_string(
 		"res://scripts/portmaster/NETfishing.sh"
 	)
-	assert(launcher.contains("allwinner,h616"))
+	assert(launcher.contains("NETFISHING_PERFORMANCE_PROFILE:-"))
-	assert(launcher.contains("sun50iw9p1"))
+	assert(launcher.contains("$CONFDIR/performance_profile"))
+	assert(launcher.contains("normal)"))
+	assert(launcher.contains("light|\"\")"))
+	assert(launcher.contains("NETFISHING_PERFORMANCE_PROFILE=normal"))
+	assert(launcher.contains("NETFISHING_PERFORMANCE_PROFILE=light"))
 	assert(launcher.contains("NETFISHING_LOW_END=1"))
 	assert(launcher.contains("--max-fps 30"))
 	assert(launcher.contains("--audio-output-latency 40"))

tests/light_performance_profile_validation.gd

@@ -0,0 +1,108 @@
+extends SceneTree
+
+const MainScene: PackedScene = preload("res://main/main.tscn")
+const RuntimePerformanceProfileType = preload(
+	"res://main/runtime_performance_profile.gd"
+)
+
+
+func _initialize() -> void:
+	call_deferred("_run")
+
+
+func _run() -> void:
+	_validate_profile_resolution()
+	OS.set_environment(
+		RuntimePerformanceProfileType.PROFILE_ENVIRONMENT_VARIABLE,
+		"light",
+	)
+	root.size = Vector2i(640, 480)
+	var main: Node = MainScene.instantiate()
+	root.add_child(main)
+	for _frame: int in 4:
+		await process_frame
+	if not bool(main.get("_application_initialized")):
+		main.call("_activate_selected_data_path", "", true)
+	for _frame: int in 8:
+		await process_frame
+	assert(bool(main.get("_application_initialized")))
+	_validate_main_profile(main)
+	_validate_minimal_weather(main)
+	main.queue_free()
+	for _frame: int in 4:
+		await process_frame
+	OS.unset_environment(
+		RuntimePerformanceProfileType.PROFILE_ENVIRONMENT_VARIABLE
+	)
+	print("Light performance profile validation: PASS")
+	quit()
+
+
+func _validate_profile_resolution() -> void:
+	var normal := RuntimePerformanceProfileType.from_name(&"normal")
+	var light := RuntimePerformanceProfileType.from_name(&"light")
+	var legacy := RuntimePerformanceProfileType.from_name(&"", true)
+	assert(not normal.is_light())
+	assert(is_equal_approx(normal.get_world_render_scale(), 1.0))
+	assert(light.is_light())
+	assert(is_equal_approx(light.get_world_render_scale(), 0.5))
+	assert(legacy.is_light())
+
+
+func _validate_main_profile(main: Node) -> void:
+	var profile: RuntimePerformanceProfile = main.get("_performance_profile")
+	assert(profile != null and profile.is_light())
+	assert(is_equal_approx(root.scaling_3d_scale, 0.5))
+	var pixelation: Node = main.get_node("%WorldPixelationPostprocess")
+	assert(bool(pixelation.call("is_light_performance_profile")))
+	pixelation.call("set_gameplay_active", true)
+	var screen_grid := pixelation.get_node("ScreenGrid") as ColorRect
+	assert(screen_grid != null and not screen_grid.visible)
+
+	var pond := main.get_node(
+		"TestWorld/Regions/StarterIslandRegion/WaterBodies/Pond/VisualWater"
+	) as MeshInstance3D
+	var ocean := main.get_node(
+		"TestWorld/Regions/StarterIslandRegion/WaterBodies/Ocean/VisualWater"
+	) as MeshInstance3D
+	assert(pond.material_override is StandardMaterial3D)
+	assert(ocean.material_override is StandardMaterial3D)
+	assert(not pond.material_override is ShaderMaterial)
+	assert(not ocean.material_override is ShaderMaterial)
+	assert(not ocean.is_processing())
+
+
+func _validate_minimal_weather(main: Node) -> void:
+	var visuals: WorldTimeVisualController = main.get_node(
+		"%WorldTimeVisualController"
+	)
+	var rain := visuals.get_node("LocalRain") as GPUParticles3D
+	assert(rain.amount == WorldTimeVisualController.LIGHT_RAIN_PARTICLE_AMOUNT)
+	assert(rain.fixed_fps == WorldTimeVisualController.LIGHT_RAIN_FIXED_FPS)
+	var clouds := visuals.get_node("LocalStormClouds") as LocalStormCloudLayer
+	assert(clouds.get_patch_count() == 1)
+	var ceiling := clouds.get_node("CloudCeiling") as MeshInstance3D
+	assert(ceiling != null and ceiling.mesh is PlaneMesh)
+	assert(ceiling.material_override == null)
+	assert((ceiling.mesh as PlaneMesh).material is StandardMaterial3D)
+
+	visuals.apply_weather_immediately(WorldWeatherService.Weather.RAINY)
+	assert(rain.emitting and rain.amount_ratio > 0.99)
+	assert(clouds.visible and clouds.get_storm_amount() > 0.87)
+	var cloud_material := (
+		(ceiling.mesh as PlaneMesh).material as StandardMaterial3D
+	)
+	assert(cloud_material.albedo_color.a < 0.65)
+	var test_world := main.get_node("TestWorld") as TestWorld
+	var runtime_environment := (
+		test_world.get_world_environment().environment as Environment
+	)
+	var sky_material := (
+		runtime_environment.sky.sky_material as ShaderMaterial
+	)
+	assert(is_zero_approx(float(
+		sky_material.get_shader_parameter("cloud_coverage")
+	)))
+	assert(is_zero_approx(float(
+		sky_material.get_shader_parameter("cloud_opacity")
+	)))

tests/light_performance_profile_validation.gd.uid

@@ -0,0 +1 @@
+uid://c6xqcslinxd1a

world/environment/local_storm_cloud_layer.gd

@@ -13,6 +13,9 @@ const DISTANCE_FADE_START: float = 240.0
 const DISTANCE_FADE_END: float = 300.0
 const WRAP_RADIUS: float = FIELD_HALF_EXTENT
 const MAXIMUM_OPACITY: float = 1.0
+const LIGHT_CEILING_SIZE: float = 520.0
+const LIGHT_CEILING_ALTITUDE: float = 20.0
+const LIGHT_MAXIMUM_OPACITY: float = 0.72
 const BASE_VELOCITY := Vector2(0.825, -0.45)
 const BODY_OUTLINE: Array[Vector2] = [
 	Vector2(-6.9, -0.8),
@@ -50,12 +53,23 @@ var _target: Node3D
 var _material: ShaderMaterial
 var _multimesh: MultiMesh
 var _cloud_mesh: MultiMeshInstance3D
+var _light_cloud_mesh: MeshInstance3D
+var _light_material: StandardMaterial3D
 var _drift_offset := Vector2.ZERO
 var _storm_amount: float = 0.0
+var _light_performance_profile: bool = false
 
 
-func setup(target: Node3D) -> void:
+func setup(
+	target: Node3D,
+	light_performance_profile: bool = false,
+) -> void:
 	_target = target
+	_light_performance_profile = light_performance_profile
+	if _light_performance_profile:
+		_build_light_cloud_ceiling()
+		_update_light_position()
+	else:
 		_build_cloud_field()
 		_update_cloud_transforms()
 	set_process(true)
@@ -65,8 +79,19 @@ func set_storm_amount(amount: float, color: Color) -> void:
 	_storm_amount = clampf(amount, 0.0, 1.0)
 	var should_be_visible: bool = _storm_amount > 0.001
 	if should_be_visible and not visible:
+		if _light_performance_profile:
+			_update_light_position()
+		else:
 			_update_cloud_transforms()
 	visible = should_be_visible
+	if _light_performance_profile:
+		if _light_material != null:
+			var light_color: Color = color
+			light_color.a = (
+				_storm_amount * LIGHT_MAXIMUM_OPACITY
+			)
+			_light_material.albedo_color = light_color
+		return
 	if _material == null:
 		return
 	_material.set_shader_parameter("weather_opacity", _storm_amount)
@@ -78,12 +103,19 @@ func get_storm_amount() -> float:
 
 
 func get_patch_count() -> int:
-	return GRID_AXIS_COUNT * GRID_AXIS_COUNT
+	return (
+		1
+		if _light_performance_profile
+		else GRID_AXIS_COUNT * GRID_AXIS_COUNT
+	)
 
 
 func _process(delta: float) -> void:
 	if not visible or _target == null or not is_instance_valid(_target):
 		return
+	if _light_performance_profile:
+		_update_light_position()
+		return
 	_drift_offset += BASE_VELOCITY * delta
 	_drift_offset = Vector2(
 		_wrap_axis(_drift_offset.x),
@@ -128,6 +160,37 @@ func _build_cloud_field() -> void:
 	visible = false
 
 
+func _build_light_cloud_ceiling() -> void:
+	_light_material = StandardMaterial3D.new()
+	_light_material.resource_name = "light_cloud_ceiling"
+	_light_material.transparency = BaseMaterial3D.TRANSPARENCY_ALPHA
+	_light_material.shading_mode = BaseMaterial3D.SHADING_MODE_UNSHADED
+	_light_material.cull_mode = BaseMaterial3D.CULL_DISABLED
+	_light_material.albedo_color = Color(0.22, 0.25, 0.26, 0.0)
+	var ceiling_mesh := PlaneMesh.new()
+	ceiling_mesh.size = Vector2.ONE * LIGHT_CEILING_SIZE
+	ceiling_mesh.material = _light_material
+	_light_cloud_mesh = MeshInstance3D.new()
+	_light_cloud_mesh.name = "CloudCeiling"
+	_light_cloud_mesh.position.y = LIGHT_CEILING_ALTITUDE
+	_light_cloud_mesh.mesh = ceiling_mesh
+	_light_cloud_mesh.cast_shadow = (
+		GeometryInstance3D.SHADOW_CASTING_SETTING_OFF
+	)
+	add_child(_light_cloud_mesh)
+	visible = false
+
+
+func _update_light_position() -> void:
+	if _target == null or not is_instance_valid(_target):
+		return
+	global_position = Vector3(
+		_target.global_position.x,
+		0.0,
+		_target.global_position.z,
+	)
+
+
 func _build_cloud_body_mesh() -> ArrayMesh:
 	var outline := PackedVector2Array(BODY_OUTLINE)
 	var surface_tool := SurfaceTool.new()

world/regions/starter_island_region.gd

@@ -13,6 +13,14 @@ const FOLIAGE_MATERIAL_NAMES: Array[StringName] = [
 	&"leaf_light",
 	&"leaf_dark",
 ]
+const NORMAL_SALT_WATER_MATERIAL: Material = preload(
+	"res://world/materials/stylized_water.tres"
+)
+const NORMAL_FRESH_WATER_MATERIAL: Material = preload(
+	"res://world/materials/stylized_water_fresh.tres"
+)
+const LIGHT_SALT_WATER_COLOR := Color(0.11, 0.345, 0.435)
+const LIGHT_FRESH_WATER_COLOR := Color(0.18, 0.46, 0.50)
 
 @export_group("Owned Nodes")
 @export_node_path("MeshInstance3D")
@@ -60,6 +68,48 @@ func get_saltwater_shoreline_mesh() -> MeshInstance3D:
 	return get_node_or_null(^"ShorelineRibbons/Ocean") as MeshInstance3D
 
 
+func set_light_performance_profile(enabled: bool) -> void:
+	var pond := get_node_or_null(
+		^"WaterBodies/Pond/VisualWater"
+	) as MeshInstance3D
+	var ocean := get_node_or_null(
+		^"WaterBodies/Ocean/VisualWater"
+	) as MeshInstance3D
+	if pond != null:
+		pond.material_override = (
+			_create_light_water_material(
+				LIGHT_FRESH_WATER_COLOR,
+				&"light_fresh_water",
+			)
+			if enabled
+			else NORMAL_FRESH_WATER_MATERIAL
+		)
+	if ocean != null:
+		ocean.material_override = (
+			_create_light_water_material(
+				LIGHT_SALT_WATER_COLOR,
+				&"light_salt_water",
+			)
+			if enabled
+			else NORMAL_SALT_WATER_MATERIAL
+		)
+		var surface_motion := ocean as WaterSurfaceMotion
+		if surface_motion != null:
+			surface_motion.set_motion_enabled(not enabled)
+
+
+func _create_light_water_material(
+	color: Color,
+	material_name: StringName,
+) -> StandardMaterial3D:
+	var material := StandardMaterial3D.new()
+	material.resource_name = str(material_name)
+	material.albedo_color = color
+	material.roughness = 1.0
+	material.shading_mode = BaseMaterial3D.SHADING_MODE_PER_VERTEX
+	return material
+
+
 func get_spawn_surface_triangles(
 	material_names: Array[StringName],
 	minimum_global_y: float,

world/test_world.gd

@@ -50,6 +50,10 @@ func get_sun() -> DirectionalLight3D:
 	return _sun
 
 
+func set_light_performance_profile(enabled: bool) -> void:
+	_starter_island.set_light_performance_profile(enabled)
+
+
 func get_fishable_water_regions() -> Array[FishableWaterRegion]:
 	var waters: Array[FishableWaterRegion] = []
 	for region: WorldRegion in _get_regions():

world/water_surface_motion.gd

@@ -35,6 +35,12 @@ func _process(_delta: float) -> void:
 	)
 
 
+func set_motion_enabled(enabled: bool) -> void:
+	set_process(enabled and amplitude > 0.0)
+	if not enabled:
+		position.y = _base_height
+
+
 static func get_default_height_offset() -> float:
 	return calculate_height_offset(
 		_current_time_seconds(),

world/world_time_visual_controller.gd

@@ -2,6 +2,7 @@ class_name WorldTimeVisualController
 extends Node
 
 const UPDATE_INTERVAL_SECONDS: float = 0.1
+const LIGHT_UPDATE_INTERVAL_SECONDS: float = 0.25
 const SUN_YAW_DEGREES: float = -32.0
 const WEATHER_TRANSITION_SECONDS: float = 10.0
 const RAIN_EMITTER_OFFSET := Vector3(0.0, 7.0, 0.0)
@@ -11,6 +12,8 @@ const RAIN_VISIBILITY_AABB := AABB(
 	Vector3(27.0, 12.0, 27.0),
 )
 const RAIN_PARTICLE_AMOUNT: int = 2240
+const LIGHT_RAIN_PARTICLE_AMOUNT: int = 256
+const LIGHT_RAIN_FIXED_FPS: int = 15
 const RAIN_VELOCITY_MIN: float = 16.0
 const RAIN_VELOCITY_MAX: float = 20.0
 const RAIN_DROP_SIZE := Vector3(0.014, 0.34, 0.014)
@@ -92,6 +95,7 @@ var _weather_to: WorldWeatherService.Weather = (
 	WorldWeatherService.Weather.SUNNY
 )
 var _weather_transition: float = 1.0
+var _light_performance_profile: bool = false
 
 
 func setup(
@@ -101,6 +105,7 @@ func setup(
 	weather_service: WorldWeatherService = null,
 	rain_target: Node3D = null,
 	rain_camera_provider: Callable = Callable(),
+	light_performance_profile: bool = false,
 ) -> void:
 	_time_service = time_service
 	_weather_service = weather_service
@@ -108,6 +113,7 @@ func setup(
 	_sun = sun
 	_rain_target = rain_target
 	_rain_camera_provider = rain_camera_provider
+	_light_performance_profile = light_performance_profile
 	if not _prepare_runtime_environment():
 		set_process(false)
 		return
@@ -135,7 +141,12 @@ func _process(delta: float) -> void:
 			1.0,
 		)
 	_elapsed += delta
-	if _elapsed < UPDATE_INTERVAL_SECONDS:
+	var update_interval: float = (
+		LIGHT_UPDATE_INTERVAL_SECONDS
+		if _light_performance_profile
+		else UPDATE_INTERVAL_SECONDS
+	)
+	if _elapsed < update_interval:
 		return
 	_elapsed = 0.0
 	_apply_time(_time_service.get_time_hours())
@@ -187,10 +198,16 @@ func _prepare_runtime_environment() -> bool:
 func _prepare_rain() -> void:
 	_rain = GPUParticles3D.new()
 	_rain.name = "LocalRain"
-	_rain.amount = RAIN_PARTICLE_AMOUNT
+	_rain.amount = (
+		LIGHT_RAIN_PARTICLE_AMOUNT
+		if _light_performance_profile
+		else RAIN_PARTICLE_AMOUNT
+	)
 	_rain.amount_ratio = 0.0
 	_rain.lifetime = 1.25
-	_rain.fixed_fps = 30
+	_rain.fixed_fps = (
+		LIGHT_RAIN_FIXED_FPS if _light_performance_profile else 30
+	)
 	_rain.local_coords = false
 	_rain.visibility_aabb = RAIN_VISIBILITY_AABB
 	var process_material := ParticleProcessMaterial.new()
@@ -220,7 +237,7 @@ func _prepare_storm_clouds() -> void:
 	_storm_clouds = LocalStormCloudLayerType.new()
 	_storm_clouds.name = "LocalStormClouds"
 	add_child(_storm_clouds)
-	_storm_clouds.setup(_rain_target)
+	_storm_clouds.setup(_rain_target, _light_performance_profile)
 
 
 func _apply_time(time_hours: float) -> void:
@@ -259,6 +276,33 @@ func _apply_time(time_hours: float) -> void:
 	var fog_color: Color = _blended_color(
 		NIGHT_FOG, DAY_FOG, WARM_FOG, daylight, warmth
 	)
+	if _light_performance_profile:
+		var simple_cloud_color := _blended_color(
+			NIGHT_CLOUD_SHADOW,
+			DAY_CLOUD_SHADOW,
+			WARM_CLOUD_SHADOW,
+			daylight,
+			warmth,
+		)
+		var simple_overcast: float = _weather_value(
+			0.0,
+			0.55,
+			0.82,
+			0.0,
+		)
+		sky_top = sky_top.lerp(simple_cloud_color, simple_overcast)
+		sky_horizon = sky_horizon.lerp(
+			simple_cloud_color.lightened(0.08),
+			simple_overcast,
+		)
+		ground_bottom = ground_bottom.lerp(
+			simple_cloud_color.darkened(0.12),
+			simple_overcast * 0.65,
+		)
+		ground_horizon = ground_horizon.lerp(
+			simple_cloud_color,
+			simple_overcast * 0.75,
+		)
 	var foggy_fog_amount: float = _weather_value(0.0, 0.0, 0.0, 1.0)
 	var rain_fog_amount: float = _weather_value(0.0, 0.0, 1.0, 0.0)
 	var fog_daylight_amount: float = daylight * foggy_fog_amount
@@ -399,6 +443,8 @@ func _apply_water_environment(
 	foggy_horizon_occlusion: float,
 	fog_render_color: Color,
 ) -> void:
+	if _light_performance_profile:
+		return
 	var water_tint := _blended_color(
 		NIGHT_WATER_TINT,
 		Color.WHITE,
@@ -561,6 +607,15 @@ func _apply_sky_clouds(daylight: float, warmth: float) -> void:
 		daylight,
 		warmth,
 	)
+	if _light_performance_profile:
+		_sky_material.set_shader_parameter("cloud_coverage", 0.0)
+		_sky_material.set_shader_parameter("cloud_opacity", 0.0)
+		if _storm_clouds != null:
+			_storm_clouds.set_storm_amount(
+				_weather_value(0.0, 0.42, 0.88, 0.0),
+				lower_cloud_color,
+			)
+		return
 	_sky_material.set_shader_parameter(
 		"cloud_coverage",
 		_weather_value(0.0, 0.58, 0.985, 0.0),