Huge physics problem of Godot 4

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Engardium

Our team is porting the game from Godot 3.5 to Godot 4. We have discovered a huge physics issue in Godot 4. When a character collides with a concave body, there is a catastrophic performance degradation. This is especially pronounced when colliding with sharp corners.
You can watch it on video. I checked many times that the problem lies precisely in physics. Godot 3 didn't have this problem.

Megalomaniak

Then assuming you haven't yet you should definitely open an issue on the tracker. Though typically one should search first to see if an issue is already reported. A quick search brought me to this(note the milestone on this is marked as 4.0):
https://github.com/godotengine/godot/issues/57313

If you think it might be the same issue, perhaps add a reaction such as thumbs up to it and follow the discussion there, maybe you find you have some further feedback to offer.

Engardium

Megalomaniak Thank you. I've added a description of the problem to this ticket.

Lethn

Godot 4 is a pretty vague term, there are multiple versions, could you tell us if you're in beta or release candidate?

Engardium

Lethn RC 2

Lethn

Engardium Definitely do what @Megalomaniak posted then and submit an issue, I was just wondering because there are a lot of changes happening right now and I've suddenly found myself having issues and then updating and it all magically fixes itself next version.

Engardium

Lethn I sent a case test and video instruction in Git. I'm duplicating it here.

Test scene
https://github.com/godotengine/godot/files/10790667/test_level.zip

Test video showing how to get catastrophic performance degradation. To get the effect, you need to go into the wall in the indicated areas. Any monster stuck in such places makes the game impossible to play.

cybereality

Godot 3.x used Bullet Physics (by default) and Godot 4.0 dropped that for a custom physics engine (which I don't understand why, but okay).

However, Godot Physics is not as fully featured as Bullet and seems to be somewhat unfinished.

If those objects are static bodies, you are better off using "Make multiple convex siblings". Concave physics objects were always a little slow anyway, so I've been doing that for a while.