High CPU useage

[oldschoola]

Bug Description

Is this normal CPU usage? its using a full core

How to Reproduce

Running on a headless sever, from netcup.

Expected Behavior

Low cpu?

Operating system(s) on local (controlling) side and remote (controlled) side

Linux Debian

RustDesk Version(s) on local (controlling) side and remote (controlled) side

Newest

Screenshots

Additional Context

No response

[oldschoola]

anything i can try to reduce the cpu useage?

[open-trade]

https://www.reddit.com/r/rustdesk/comments/1mi3l29/high_cpu_usage_anyone_know_how_to_fix/

[oldschoola]

yeah that's my thread, i found that running the relay on another sever decreased the cpu usage by like 99 percent.
it now takes up 1 percent cpu.

[oldschoola]

still taking up 5 to 10 percent and spawns lots of processes

[Demon000]

I have a similar issue, where rustdesk takes 100% CPU. I'm using version 1.4.2. I'm on Arch and connecting to a Windows 11 PC.

[pormr]

I have a similar setup to yours, and am also experiencing CPU usage issue after updating to 1.4.2 (from Flathub). I noticed that my RustDesk client on the control side kept using around 100% CPU constantly once connected. Yet the CPU usage of RustDesk server processes was relatively normal (~1%, both hbbs and hbbr on the same machine). The post mentioned that the CPU usage is mainly attributed to rustdesk --server and spawned processes, so it might be a different issue.

[Demon000]

Downgrading to 1.4.1 seems to ameliorate the issue, although FPS is still rather low.

[rustdesk]

@21pages

[yump]

Yeah, there's seemingly an unthrottled infinite loop somewhere. 100% of one core on the Linux client, even when Windows server is set to VP9 + 10% bitrate + 5 FPS.

@rustdesk this should perhaps be converted back into an issue, not a discussion.

[21pages]

How about linux sciter version as the controlling side?

[murilo-kendjy]

I'm having the same problem in v1.4.2. The problem doesn't happen in v1.4.1

Version
v1.4.2 (flatpak)

Operating system(s)
Linux Manjaro (controlling) => Win11 (controlled)

v1.4.1

htop and top -H -p 891254

v1.4.2

htop and top -H -p 882796

v1.4.2 sciter

htop and top -H -p 911104

Additional Context
Not sure about @oldschoola and @Demon000, but I'm using Wayland

[21pages]

Thanks for your feedback. Could you try more versions to see which commit causing the issue? No need to change the codec anymore.

https://github.com/21pages/rustdesk/releases/tag/revert_update_codec_build

https://github.com/21pages/rustdesk/releases/tag/before_cursor_linux_f933f46_build

[murilo-kendjy]

Tested all of them in codec Auto (H265)

v1.4.1 (OK)
Build date: 2025-07-29 04:21

v1.4.2 - latest (CPU PROBLEM)
Build date: 2025-09-15 07:00

v1.4.2 - before_update_codec_build (OK)
Build date: 2025-09-22 10:38

v1.4.2 - revert_update_codec_build (CPU PROBLEM)
Build date: 2025-10-03 15:02

v1.4.2 - before_cursor_linux_f933f46_build (OK)
Build date: 2025-10-03 13:14

[21pages]

Did you enable show my cursor(in keyboard menu, seems not)?

https://github.com/21pages/rustdesk/releases/tag/after_cursor_linux_build This build will be ready soon.

[murilo-kendjy]

Nope, didn't even know this option existed, but I double checked here and it was disabled in all my tests.

v1.4.2 - after_cursor_linux_build (CPU PROBLEM)
Build date: 2025-10-03 16:10

[21pages]

Thanks, will fix it.

[rustdesk]

Another case https://discord.com/channels/804630702657110016/804630702657110018/1424307900305772556

[oldschoola]

@21pages have a new test? i can test as well.

[21pages]

Thanks! Not yet, we’ll let you know once we’ve put a fix in.

[vlw]

@21pages On 1.4.2, I also have 100% CPU usage (Linux KDE Neon). There is no problem on 1.4.1. You don't even need to connect, just open the main RustDesk window. If I close it and the application remains in the tray, the CPU usage disappears.

Are there any versions available for testing?

[21pages]

Thanks for your feedback, it can be reproduced — it’s the same issue as mentioned above. Once it’s fixed, I hope you can help test it again.

[fabianwimberger]

Can confirm issue and workaround (downgrade).

Downgrade (if installed via flatpak):
sudo flatpak update --commit=6ce85bfb7d5c26469c9ab26d65c7e709e6ff34ab7861668ff584dab955961485 com.rustdesk.RustDesk

[21pages]

We have put a fix #13179, please try latest nightly

[vlw]

Installed the nightly build, bug fixed, thank you.

[fabianwimberger]

Same here, got the flatpak, all fine.