If shaders are taking a long time, it could be due to your CPU not issuing the correct information to your system or steam. Below is the fix.
System install:
$ nproc
$ mousepad ~/.steam/steam/steam_dev.cfg
unShaderBackgroundProcessingThreads x
Replace X with the number of cores that nporc told you. If you installed it with flatpak, do the below.
Flatpak Install:
$ nproc
$ mousepad /.var/app/com.valvesoftware.Steam/data/Steam
unShaderBackgroundProcessingThreads x
Replace X with the number of cores that nporc told you.
More info:
https://steamcommunity.com/discussions/forum/1/4423184732111747107/
https://wiki.archlinux.org/title/Steam ⬅ 5.11 Faster shader pre-compilation
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