as you know many times the video games are linked to the physics working through the fps. To solve this, a scrip was created to make the player's speed not decrease at low fps, and at high fps the opposite effect does not increase too much. Well this in gameguru was before, since at 10 fps or 20 the speed never decreases always remained in the same, what changed were only the frames nothing more.
but it seems that something is wrong and now at 20 fps it is unplayable ganmeguru and gameguru max, ruining the whole game experience, the physics breaking and the player, goes at the speed of 100 goes at the speed of 30 or 40, depends on whether you have 20 or 30 fps. it is horrible to solve it please, there are videos on youtube like alva majo that explains very well how to solve it, just an example.
Game Guru - [mapbank_Años 60 parallel capitulo 2 principio.fpm_] - [Entity Editing Mode] 2021-10-10 16-47-33.mp4

Max is in alpha production not even early access. Sorry to say that but when it is released as early access then i think you can send github to bug or send it now. But there's a million thimgs they are sorting out at present so patience somethimg i agree we lose from time to time.
You should not really be expecting anything from max at all tbh
Till its released then this im. Sure will either be sorted or in the pipeline.

As to game guru if you send a message to tgc regarding this then I'm sure they can look into this for you

Hope this helps

Since you are playing indoor level, maybe you don't need terrain_shader and grass_shader that high; if your level is entirely indoor level, so, you don't need even the terrain and neither the water; you can hide them via script named "goindoors.lua" it sits in scriptbank folder.

Edit: Just realize you are looking for both GG and GGMax; so, I should add that my post is just about GG.

I speak more because this error of fps and speed is also happening in gameguru max and is a mistake in both gameguru and gameguru max. Let's hope it gets a hard time, as it's the foundation of any game that speed and physics are without these bugs and functional. I wish without taking credit away from the one who created gameguru and gameguru max, who is doing a great job offering us mistakes to be able to create our games or projects.

the water and remove it the same thanks 3com uwu

let's hope they drag it out.
is what I meant, excuse me I'm using google translator

let's wait for it to be fixed.
is what I meant, I fail to return the google translator

I failed again, google translate wrote everything wrong, I give up is very bad