Summary
I’ve encountered a significant performance issue with UE 5.7.1 on Arch Linux that wasn’t present in 5.5 or 5.6.
- Multiple EpicWebHelper processes consuming 30-40% CPU constantly
- High CPU usage persists even when editor is minimized or not in focus
- Affected processes: EpicWebHelper (storage.mojom.StorageService, renderer, gpu-process)
- This behavior is specific to Linux; Windows version works fine
Please select what you are reporting on:
Creative
What Type of Bug are you experiencing?
Stability
Steps to Reproduce
- Install UE 5.7.1 on Arch Linux
- Open any project through Project Browser
- Monitor CPU usage with ‘top’ or ‘htop’
- Observe multiple EpicWebHelper processes with high CPU usage
Expected Result
Editor should have low/minimal CPU usage when idle (similar to UE 5.5/5.6 behavior).
Expected idle CPU usage: 5-10% maximum when editor window is open but inactive.
On Windows with UE 5.7.1 and on Linux with UE 5.5/5.6, the editor behaves
as expected with minimal background CPU usage.
Observed Result
Multiple EpicWebHelper processes consume 30-40% CPU constantly after opening a project.
The high CPU usage persists even when the editor is minimized or not in focus.
Specifically:
- EpicWebHelper (storage.mojom.StorageService): ~37% CPU
- EpicWebHelper (renderer/gpu-process): ~15-20% CPU each
- Total idle CPU usage: 60-80% with editor doing nothing
This significantly impacts system performance and makes the editor unusable
for extended work sessions on Linux.
Platform(s)
Operating System: Arch Linux
KDE Plasma Version: 6.5.4
KDE Frameworks Version: 6.21.0
Qt Version: 6.10.1
Kernel Version: 6.18.3-zen1-1-zen (64-bit)
Graphics Platform: X11
Processors: 24 × AMD Ryzen 9 5900X 12-Core Processor
Memory: 128 ГиБ of RAM
Graphics Processor: NVIDIA GeForce RTX 3090