Godot 4 Beta 10 big FPS drops Linux Ubuntu

[CHIESOFTWARE]

min test.zip

Godot version

4.0 beta 10

System information

Ubuntu Studio 22.04, 12x Intel I5 10500H 2.50GHz 4gb envidia 1650 max Q

Issue description

I have a project done in Godot 4.0 beta 8 that goes perfectly well, it has almost no code yet, only the necessary for debugging. I just opened the project in Godot 4.0 beta 9 and beta 10 and in both the project suffers a drop in FPS from 60 to 10.

I did nothing more than open the project and hit play.

Steps to reproduce

In my case I only have to open the project made in Godot 4.0 beta 8 in godot beta 9 or 10.

Minimal reproduction project

min test.zip

[Calinou]

@CHIESOFTWARE Please upload a minimal reproduction project to make this easier to troubleshoot.

[CHIESOFTWARE]

@Calinou I am currently adding and removing scenes to see which one is causing problems. If I remove some scenes and leave the basics the FPS remains stable. Apparently something in some scene must be causing the bug which doesn't happen with beta 8.

[CHIESOFTWARE]

@Calinou Can you send me an email or something to share you my project so you can help me to find what is causing this bug?

Just to clarify, I'm not trying to get you to fix my project, just that since the bug is in my entire project I'd like to pass you everything I've done to see if that helps you find the bug in Godot. But as it is something that I don't want to share publicly I would like you to send it to me in a more private way.

[Calinou]

Can you send me an email or something to share you my project so you can help me to find what is causing this bug?

We don't have time to inspect full projects individually, so I'm afraid I can't provide that.

[CHIESOFTWARE]

@Calinou I don't want you to inspect my project, I just want you to use it as a test project to find the error.

[CHIESOFTWARE]

I found some lines of code in charge of verifying the distance of the player and based on the distance change the material of the object in question. There are at least 600 of these objects, they are only checked if the player is close, i.e. all 600 are never checked at the same time or all of them.

These 10 lines of code did not give me problems in the previous beta and now they do, I am working to create a test project for you to see what causes this bug.

[Zireael07]

@CHIESOFTWARE Regardless of how you phrase it, Godot 4 is supposed to release before March. To hit that target, contributors need to focus on finishing the last features, not "use your full project to find the error". That's why you're asked to give a MRP - the smallest project you can make which has the bug

[CHIESOFTWARE]

@Zireael07 @Calinou I understand, I'm trying to get an alpha of the project for that date. I have already uploaded the test project, certain conditions are needed for the error to occur.

In the past the code you will see there did not cause any problem, now in beta 9 and 10 the process increases the milliseconds up to more than 2000ms. I don't know what changes you have made in that aspect, but it seems that there is a bottleneck when processing many objects.

[stmSi]

@CHIESOFTWARE this is not an engine issue.
Flamegraph shows that you use a lot of "material_override" 99% of time... setting material override is very expensive process.

try to minimize the material_override usage (avoid using it every frame or avoid using it with Timer every 0.5sec timeout)

I got ~55fps after i insert "return" statement at the start of function like _check_lods _cerrar_puerta_por_distancia _check_lods_room

[CHIESOFTWARE]

@stmSi Hi, Ok I understand, but why does it cause this problem only in beta 9 and 10 and not in beta 8? If that's all it should fail in all beta. I am not an expert in this area, obviously.

[stmSi]

i didn't have the debug build for beta 8, i will check it after i build it

[CHIESOFTWARE]

By the way, in the process of looking for what was causing the problem, I changed the rendering to mobile-compatible rendering and noticed that the distance fade of the lights does not work well at all.

[Calinou]

I changed the rendering to mobile-compatible rendering and noticed that the distance fade of the lights does not work well at all.

Distance fade is broken if you use any lights with projectors in the scene: #67845

[CHIESOFTWARE]

I am using omnilights, and a directional light. Luckily it works well in high quality rendering.