perf: harden runtime for weaker hardware

world/jajce/day_night_cycle.gd

@@ -34,9 +34,12 @@ const NIGHT_LIGHT_ENERGY := 0.3
 const SUNSET_LIGHT_COLOR := Color(1, 0.55, 0.3, 1)
 const SUNRISE_LIGHT_COLOR := Color(1, 0.6, 0.45, 1)
 const SUNRISE_SUNSET_ENERGY := 0.8
+const PRESENTATION_UPDATE_INTERVAL_SECONDS := 0.1
 
 var elapsed := 0.0
 var _simulation_node: Node
+var _presentation_elapsed := 0.0
+var _last_applied_cycle := -1.0
 
 
 func _ready() -> void:
@@ -47,17 +50,25 @@ func _ready() -> void:
 		_apply_environment(initial_cycle)
 
 
-func _process(_delta: float) -> void:
+func _process(delta: float) -> void:
+	_presentation_elapsed += delta
+	if _presentation_elapsed < PRESENTATION_UPDATE_INTERVAL_SECONDS:
+		return
+	var update_delta := _presentation_elapsed
+	_presentation_elapsed = 0.0
 	if _simulation_node == null or not is_instance_valid(_simulation_node):
 		_find_simulation_node()
 	var cycle: float
 	if _simulation_node != null and "clock" in _simulation_node and _simulation_node.clock != null:
 		cycle = _simulation_node.clock.time_of_day()
 	else:
-		elapsed += _delta
+		elapsed += update_delta
 		if elapsed >= cycle_duration_seconds:
 			elapsed = fmod(elapsed, cycle_duration_seconds)
 		cycle = elapsed / cycle_duration_seconds
+	if is_equal_approx(cycle, _last_applied_cycle):
+		return
+	_last_applied_cycle = cycle
 	_apply_light_rotation(cycle)
 	_apply_environment(cycle)