Proton: [Feedback] Proton 4.11 much better than 5.0

[IvoAndonov]

From all the games I have on Steam (at least those for windows, anyway), only a handful of them run fine with Proton 5.0. Specifically, those with good performance with 4.11 are Hard Truck Apocalypse, RAGE 1, NFS Rivals, Euro Truck 2 and ATS (yes, I know these two have native linux versions but I was testing stuff, that's why I forced them to use Proton), 18 WOS Extreme Trucker 1 & 2 and many others. Whereas with Proton 5.0 only CarX Drift Racing Online runs fine. Titan Quest AE and GTA 5 have the same problems in both 4.11 and 5.0 - flickering lights and shadows, travelling shadows and static objects (objects that shouldn't travel with the character, such as trash cans and traffic lights), etc. Also, the games that run fine with 4.11 have perfect sound whereas with 5.0 the sound is awful, sometimes it's completely missing. There are just too many games that run poorly with Proton 5.0, so I decided it would be easier to just come here and give you this feedback, instead of spending a whole week reporting bad performance.
Particularly Hard Truck Apocalypse that I mentioned above: with 4.11 it needs 20 seconds tops for the game to load and run and about 10 seconds to create or overwrite a save file. With Proton 5.0 HTA never launches - the mini-window simply hangs on "Preparing to launch HTA..." and that's it. Once I was AFK for over 30 minutes and when I came back HTA was still "prepping to launch".
IDK what you did or you didn't in 5.0 but so far it's the worst Proton version. Seems to me you released it too soon.

[ah-]

What distribution, gpu and driver version are you using?

[SharpOB]

Seems to me like a lot of this are issues on your end that nobody here could possibly help you with without having more information.

[IvoAndonov]

What distribution, gpu and driver version are you using?

OS: Arch Linux
Kernel: x86_64 Linux 5.7.7-arch1-1
Uptime: 34m
Packages: 1145
Shell: bash
Resolution: 1920x1080
DE: Cinnamon 4.6.6
WM: Muffin
WM Theme: Mint-Y-Brownish-v4.3_for-Cinnamon_by-Valso (Cinnamox-Rhino)
GTK Theme: Mint-Y-Brownish-v4.3_for-Cinnamon_by-Valso [GTK2/3]
Icon Theme: Humanity-Dark
Font: Noto Sans Bold 10
Disk: 1,0T / 1,5T (71%)
CPU: Intel Core i7-4770 @ 8x 3.9GHz [68.0°C]
GPU: GeForce GTX 1050 Ti (450.57)
RAM: 3116MiB / 32034MiB

[howdev]

May be it is better to report bug for a particular game with Proton 5 rather than making a list of all the games with issues