Your system information

Driver: NVIDIA Corporation GeForce RTX 2060 SUPER/PCIe/SSE2
Driver Version: 4.6.0 NVIDIA 460.39

Kernel Name: Linux
Kernel Version: 5.10.15-1-ck-skylake
X Server Vendor: The X.Org Foundation
X Server Release: 12010000
X Window Manager: KWin
Steam Runtime Version: steam-runtime_0.20201203.1

• Steam client version (build number or date): 1613097313
• Distribution (e.g. Ubuntu): Arch linux
• Opted into Steam client beta?: Yes
• Have you checked for system updates?: Yes

Please describe your issue in as much detail as possible:

Scrolling the steam sale page is incredibly slow.
This is caused by steamwebhelper apparently ignoring enabled gpu acceleration, since it can be reproduced in chromium too.
In chromium I could fix it by adding following chrome flags to ~/.config/chromium-flags.conf:

--ignore-gpu-blocklist
--enable-gpu-rasterization
--enable-zero-copy
--disable-gpu-driver-bug-workarounds

But since Steam does not respect this config, and there is no possibility to modify chrome://flags, I could not apply this workaround to steamwebhelper. Issue is not affected by setting "Enable GPU accelerated rendering in web views", or any other setting.

Steps for reproducing this issue:

1. Open steam
2. Click "Store"
3. click on lurar sale banner
4. scroll