Huge performance drop after switching from 4.26 to 5.0

Development Programming & Scripting
1

Hello!

I recently upgraded my project from version 4.26 to 5.0.3. However, I noticed a huge performance drop. After a quick look at what is causing the problem, it turned out that the cause is on the CPU side. To be more precise, it is due to the large number of AI characters that walk around the map.

So I created a new, empty project and decided to compare what the performance of a large number of AI looks like on versions 4.26 and 5.0.3. The map is very simple - there is only a flat floor and ~100 AI units walking between “random” positions.

After seeing the results of this experiment, I was very surprised at how much worse the new version of unreal performs compared to the previous one.

Below, I am sending the data from stat game command:

4.26
4.261043Ă—522 255 KB

5.0
5.01044Ă—523 298 KB

World Tick Time:

  • UE 4.26
    – Inclusive Avg: 9.49 ms
    – Inclusive Max: 14.55 ms
  • UE 5.0.3
    – Inclusive Avg: 27.59 ms
    – Inclusive Max: 39.55 ms

As you can see, the tick time almost tripled :confused:

I am also attaching the project files for both versions 4.26 and 5.0.3, in case anyone would like to check and verify this:

I also checked that the early version of unreal 5.1 looks a little better in terms of performance but is still so far from the performance of version 4.26.

Unfortunately, I have not been able to find any solution for this. Maybe someone has some ideas?

1 Like
2

Me to I got Huge FPS Loss after I transfer to UE5 almost 30 fps lost in my project and 60 fps on package build.

3

I had the same issue when I started using UE5, try disabling Lumen, set Dynamic Global Illumination Method to None: Lumen

4

Yeah I already did this and boost my performance. The Problem when you package the game. Even Low or High Setting it’s always the same 54 fps on package build. It didn’t happened in UE4 only in UE5

In UE5 Editor I can get Solid 120FPS
when I package the project or Play it on Stadalone mode I can only get 54 fps.

I tried fresh template from UE5 and package it and it’s work fine. It’s weird that it’s only on project problem.

5

When launching into game mode it re-enables lumen from my experience. So I’m guessing the packed version also forces it on startup. Maybe you need to disable it through an execute node on play if possible?
Seems the blueprint latent actions has risen significantly from ue4 to 5

6

Still the same. FPS Drop on Package I don’t know if this is bottleneck when I run the game itself. or Maybe Unreal Engine 5 is not yet ready if your project are from UE4.

I’m currently looking for answer almost 8 months now. Still no luck

7

wait ue5.26