Unstable FPS. I ask for the patch

[Mudbill]

If the custom story lags, you need to tell the creator about it so they can improve it. It's not the game's fault.

I'm sure you can already find texture compressors online if that's the way you wanna go about it. Most textures should be in DDS format though, with mipmaps enabled, which would allow the game to pick a lower resolution version if requested. But not everyone do it the same way, so really it's the creator's fault if this is a big issue.

Most likely if you experience a lot of lag after entering a new area, it's because all the physics objects in the level are falling into place and interacting, which consumes a lot of power. Once they settle, it should get better, which seems to fit with your description. This isn't something that's easily combatted without editing the custom story itself.