Enhance simulation performance and accuracy by optimizing physical amount calculations and refining arithmetic operations

stage/stage.gd

@@ -91,6 +91,8 @@ var g_counters: Dictionary[String, Counter] = {
 var g_active_items: Dictionary = {}
 
 var pending_page: int = -1
+var active_actions_dirty: bool = true
+var active_actions_elapsed: float = 0.0
 
 var owniverse:Owniverse = Owniverse.new()
 var owniverse_items: Dictionary[String, OwniverseItem] = {}
@@ -174,6 +176,7 @@ func _control_page(item: OwniverseItem) -> void:
         return
 
     g_active_items[item.item_page] = item
+    active_actions_dirty = true
 
     if current_item != null and current_item.item_page == item.item_page:
         current_item.set_selection(false)
@@ -338,6 +341,8 @@ func create_new_universe() -> void:
     description_samples.clear()
     description_rates.clear()
     description_elapsed = 0.0
+    active_actions_dirty = true
+    active_actions_elapsed = 0.0
     for label in g_item_descriptions:
         label.text = ""
     for item in owniverse_items.values():
@@ -379,8 +384,14 @@ func _process(delta: float) -> void:
 
     var actions = _check_counters(delta)
     _do_actions(actions)
-
-    _set_active_page_actions()
+    # Production limits are expensive (they walk the resource ledger). Refresh
+    # them when selection changes and at a modest cadence instead of every
+    # rendered frame. The simulation itself continues to run every frame.
+    active_actions_elapsed += delta
+    if active_actions_dirty or active_actions_elapsed >= 0.1:
+        active_actions_elapsed = 0.0
+        active_actions_dirty = false
+        _set_active_page_actions()
 
 
 func _change_speed(delta: int) -> void: