Steam interferes with mouse polling rate

[flagbender]

Out of Steam, EA launcher, Battle.net, and Epic launcher, only Steam seems to notably affect polling rate stability. It's to the point that I could have a game running like Apex through EA or Overwatch through Battle.net and see much better polling rate stability than simply having Steam open or in system tray.

I've got the USB controller of my mouse on its own core, and all Steam processes on different cores using ProcessLasso. Timer resolution is 0.5ms. When mousetester launches, it enables performance mode on my system, so all power savings off. No USB selective suspend. Finally, on Steam itself I have all options disabled like HW acceleration, smooth scrolling, icons, shop, notifications, overlay - all disabled, and it's running in "small mode".

Mouse is a Deathadder V3 Pro in 4khz using the 8khz dongle, running Windows 11 24H2 (23H2 was the same), core isolation off. CPU is 5800X3D on X570, and mouse is on one of the ports going directly to the CPU.

Graphs below. Note that in both scenarios, the interval graphs show consistent 0.25ms intervals.... Any ideas about this please?

With Steam off:

Screenshot 2024-09-22 124325.png (121.76 KiB) Viewed 3672 times

With Steam on:

Screenshot 2024-09-22 124102.png (237.38 KiB) Viewed 3672 times

[Slender]

https://github.com/Aetopia/NoSteamWebHelper
/thread

[flagbender]

https://github.com/Aetopia/NoSteamWebHelper
/thread

Firefox and Virustotal reported half of AV software identifies it as malware, so I didn't take the risk. But it did lead me to this:

"C:\Program Files (x86)\Steam\Steam.exe" -cef-disable-d3d11 -cef-single-process -nocrashmonitor -cef-disable-breakpad +open steam://open/minigameslist

This did make a difference, so thanks

[kosmicSeven]

/thread

Firefox and Virustotal reported half of AV software identifies it as malware, so I didn't take the risk. But it did lead me to this:

"C:\Program Files (x86)\Steam\Steam.exe" -cef-disable-d3d11 -cef-single-process -nocrashmonitor -cef-disable-breakpad +open steam://open/minigameslist

This did make a difference, so thanks

Thank you!!! Overwatch 2 has been feeling like my sensitivity was changing between game launches. I assume it's because of this variable latency. I've tried reinstalling windows 11 24H2, disable HPET, High Priority, Disable Devices (Realtek Audio, NVIDIA Audio etc.), switch between USBs on motherboard, PCIE USB for mouse only and all other blurbuster forum suggestions and now reverting back after these settings didn't work.

My Beast X Max polling at 8000hz has never felt more consistent in game.

Overwatch 2 (Windows 11 24H2)
Windows Mouse: level 6 (Middle)
Enhanced Precision: Off
DPI: 3200
Polling: 8000hz
Overwatch Sensitivity: 3.18
GPU: RTX 4090
CPU: 7800x3D
RAM: 6000mhz 2x32gb cl30
Monitor: ASUS PG248QP 540hz 1080p
Mouse: Beast X Max
Keyboard: Wooting 60HE