Godot 4 Optimization & Memory Leaks

Experiencing severe memory leaks in a 2D Godot 4 metroidvania project. Framerates drop from 60 to 15 after a few level transitions. Need an expert in GDScript to profile the game, implement object pooling for projectiles/enemies, and fix the level-loading logic (queue_free) so assets actually unload. Source code and QA logs showing exact crash locations are available. Strict 3-week deadline.