Go to > In-Game and uncheck Enable the Steam Overlay while in-game .

You must defrag it. If you have an SSD, ensure TRIM is enabled.

RPG Maker games often lag because they try to spread tasks across multiple CPU cores, which the engine doesn't support well. Task Manager while the game is running. tab and right-click Set Affinity and uncheck "All Processors." Select only (e.g., CPU 0) and click OK. Run as Administrator: Right-click your game folder's and select Run as Administrator to ensure the game has full access to system resources. While in-game, press to open the built-in engine settings. Check the box for "Reduce Screen Flickering" to stabilize the frame rate. Steam Community 3. Steam Deck & Mobile Fixes

If the vanilla game files are corrupted or inefficient, community tools can resolve the issue.

Concise recommended workflow (summary)

Pokémon Insurgence is not GPU-bound – it's CPU/Render bound.