Performance Optimization

Profiler-driven analysis, object pooling, and visibility culling define optimized game performance.

Available Scripts

custom_performance_monitor.gd

Manager for adding and updating custom performance monitors in the Godot debugger.

multimesh_foliage_manager.gd

Expert MultiMesh pattern for rendering thousands of foliage instances efficiently.

NEVER Do in Performance Optimization

• NEVER optimize without profiling first — “I think physics is slow” without data? Premature optimization. ALWAYS use Debug → Profiler (F3) to identify actual bottleneck.
• NEVER use print() in release builds — print() every frame = file I/O bottleneck + log spam. Use @warning_ignore or conditional if OS.is_debug_build():.
• NEVER ignore VisibleOnScreenNotifier2D for off-screen entities — Enemies processing logic off-screen = wasted CPU. Disable set_process(false) when screen_exited.
• NEVER instantiate nodes in hot loops — for i in 1000: var bullet = Bullet.new() = 1000 allocations. Use object pools, reuse instances.
• NEVER use get_node() in _process() — Calling get_node("Player") 60x/sec = tree traversal spam. Cache in @onready var player := $Player.
• NEVER forget to batch draw calls — 1000 unique sprites = 1000 draw calls. Use TextureAtlas (sprite sheets) + MultiMesh for instanced rendering.

Debug → Profiler (F3)

Tabs:

• Time: Function call times
• Memory: RAM usage
• Network: RPCs, bandwidth
• Physics: Collision checks

Common Optimizations

Object Pooling

var bullet_pool: Array[Node] = []

func get_bullet() -> Node:
    if bullet_pool.is_empty():
        return Bullet.new()
    return bullet_pool.pop_back()

func return_bullet(bullet: Node) -> void:
    bullet.hide()
    bullet_pool.append(bullet)

Visibility Notifier

# Add VisibleOnScreenNotifier2D
# Disable processing when off-screen
func _on_screen_exited() -> void:
    set_process(false)

func _on_screen_entered() -> void:
    set_process(true)

Reduce Draw Calls

# Use TextureAtlas (sprite sheets)
# Batch similar materials
# Fewer unique textures

Reference

• Godot Docs: Performance Optimization

Related

• Master Skill: godot-master