Threads in Unreal Engine 5 — Why is the game lagging?
We're exploring one of the most important topics for understanding performance in Unreal Engine 5. If your game is lagging but your GPU is free, it's most likely the Game Thread. In this video, we'll cover threads and multithreading, how UE5 distributes work between CPU cores, why game logic resides strictly on a single thread, and how to find the bottleneck in your project right in the editor.
Timecodes:
0:00 — Introduction
0:12 — What's in this video?
0:57 — What are threads and multithreading?
3:37 — Frame Budget
4:56 — Multithreading in Unreal Engine 5
5:34 — Game Thread
6:58 — Render Thread
8:21 — RHI Thread and Worker Threads
9:58 — Why is there only one Game Thread?
11:40 — Race Condition
12:34 — Solution from Unreal Engine
13:48 — What is Task Graph?
15:44 — What can't be done outside the game thread?
17:04 — What can be done on Worker Threads?
18:12 — How to find a problem in a project? stat unit
19:33 — How to read stat unit values?
21:42 — Summary
22:34 — Conclusion
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