After upgrading to the latest stable Nvidia driver release, I got extreme flickering when kitty was the active window; almost like 5 FPS. Others have mentioned similar problems with Xfce and an array of apps, as posted here: https://forums.developer.nvidia.com/t/580-release-feedback-discussion/341205/937
I cannot replicate this on any other DE (tested Cinnamon, Budgie, COSMIC, and KDE).
What GPU do you have?
4090, using nvidia-open-dkms.
EDIT: sorry, I meant 4060.
same on side Xfce & X11 + GTX 970 series , version 5.80 119 is a very bad one by nvidia
windows are blinking / disappears / appears
Same here with Xfce and GeForce 1030, random flickering at times, sometimes more, sometimes less.
Seems that it depends on which apps are currently using the screen.
Downgraded to nvidia-dkms 580.105.08-5 with all related Nvidia packages, and now it works well.
I will try it with Plasma soon.
Not sure why it’s only affecting kitty on my system. But you’re right - it’s definitely a bad one.
On Plasma/Wayland (after short test) all seems to work well. No flickering like with Xfce/X11.
This is the same installation, I have both Xfce and Plasma installed.
On Xfce the flickering started immediately.
Edit: I’m now on Plasma/x11. No flickering. So seems to be an Xfce+Nvidia problem?
The last 5+ posts on the Nvidia dev forums all suggest that. I might give the v590 beta drivers a spin later today.
I tried Xfce with Wayland, and it seems to work without flickering!
Maybe the Plasma devs are really pushing Wayland to everyone? 
Wayland working better than X11 with Nvidia??? What planet did I wake up on??? 
Wayland works fine with nvidia. Not a single issue here. My second gaming notebook performs way better with wayland then with x11. That one has a gtx 1070. Wayland = super smooth. X11 = laggy.
I’ve been meaning to try out Wayland and another DE but when I decided to install EndeavourOS I selected XFCE because I’m familiar with it and I just wanted to try out the distro to see if I want to fully commit to it and yeah I did like EndeavourOS enough as my main OS.
Anyways, I want to know how is it is to install Wayland and another DE along side my current X11 + XFCE setup. I would like to switch between them for situation like this where Nvidia or XFCE are having issues, which I am also experiencing after updating my Nvidia drivers last night, and also see performance/functionality differences.
Is there a guide or something to help me have the same setup as yours?
Well I am running wayland on xfce now and it works only to a certain extend, because it is only experimental.
To get wayland working your best bet would be to install labwc , and if you logout and next login you would have a wayland option available om the login screen. Just click on the icon next to your user name and you would get a drop down menu. But it has a number of limitations, that are mentioned on this site. For good measure I don’t have Nvidia hardware.
As @keescase mentioned, package labwc (or similar) is needed for having Wayland with Xfce. And the Wayland support is still experimental, but has been getting better gradually. I’m using Xfce with Wayland with writing this post.
To install both Xfce and KDE there’s the tool eos-packagelist that can help.
It can list and install the basic set of packages needed for those desktops.
So if you already have Xfce, run
eos-packagelist --install KDE-Desktop
to install Plasma. Note that you may need more KDE packages depending on what you want to do.
And in case of any trouble/conflicting packages/etc. note which packages get installed. That info can be found in the log /var/log/pacman.log.
v590.48 is in testing now; maybe this will be the solution…
Unfortunately not for 1030…
Hope they fix 580 series too.
Anyway, Wayland helps with flickering in Xfce.
I was just about to post that the new 590 drivers worked! 
I’m running a 4060 with the open drivers.
I must remind me that there’s also the iGPU which works. 
it says wayland fixes.. we can see that clearly ;I)
I can check tomorrow.. for today i have no wish booting on Nvidia 