UI extreme laggy on linux (modrinth 0.7.x to 0.9.x)

[cerealconjugo]

Describe the bug

Navigate through the UI its painfully laggy after updating to the last release .

Steps to reproduce

1. update Modrinth Theseus from 0.6.3 to 0.7.1 on Linux
2. try to scroll on any list to experience lag

Expected behavior

A smooth UI navigation

System information

Linux Mint 21.3 Cinnamon

Additional context

it used to work great before, i tried re-install to see if it fix the problem, but didn't. Scroll on pages like settings didn't lag at all

[jcv99]

Same on fedora 39 with appimage.
Operating System: Fedora Linux 39
KDE Plasma Version: 5.27.11
KDE Frameworks Version: 5.115.0
Qt Version: 5.15.12
Kernel Version: 6.8.7-200.fc39.x86_64 (64-bit)
Graphics Platform: X11
Processors: 16 × Intel® Core™ i7-10700KF CPU @ 3.80GHz
Memory: 15,5 GiB of RAM
Graphics Processor: NVIDIA GeForce RTX 3070/PCIe/SSE2
Manufacturer: ASUS

[dudebehinddude]

Same issue with a fresh install of Mint 21.3 Cinnamon
(Ryzen 5 2600, RTX 2060, 32GB RAM)

[linuxchr]

Same issue on Arch with Hyprland.
(Ryzen 7 5800x, RX 7700, 32GB)

[Celvee0]

Same issue with Arch and Awesome
(Ryzen 5 3600, GTX 1650S, 24GB)

[eatmyvenom]

Same again on KDE plasma 6.0+ (wayland)

[const-brick]

Same again on Debian 12.

From prior experience, on Linux, tauri apps have lots of performance / general issues due to webkitgtk.

[Kristoffeh]

Why was this marked as completed? When this issue still has not been resolved.

[dudebehinddude]

^ I feel like this issue has gotten worse with the UI overhaul from v0.9.x

[MarcPG1905]

For me it has become completely unusable and I had to switch over to another launcher for now. Just fix your damn webui thing or whatever it's called, it can't be that complicated.

[cerealconjugo]

The issue stills unsolved

[SquidDev]

This appears to be an issue with libwebkitgtk on Arch (and I assume other Linux distributions). For example, compare running the AUR version of the app (modrinth-app-bin):

Kooha-2025-01-16-10-46-58.webm

Via running the Flatpak version:

Kooha-2025-01-16-10-47-49.webm

I've been unable to get the AppImage to work (Could not create default EGL display: EGL_BAD_PARAMETER. Aborting...), which is a fairly common issue with Tauri sadly (e.g. gitbutlerapp/gitbutler#5282).

The actual issue in question appears to be (not an expert her!) that the distribution's version of webkit is not using hardware acceleration. This can be confirmed by looking at a flamegraph of the app while scrolling:

I don't think there's anything the Modrinth team can do to resolve this. This is either an issue with upstream webkit, or the distribution's version of it. If someone wants to have a go rebuilding webkitgtk with its new Skia support, it would be interesting to compare.

For now, I'd recommend people use the flatpak.