User-Agent:       Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML,
like Gecko) Chrome/86.0.4240.75 Safari/537.36
Build Identifier: 

My system freezes for few seconds when there is high disk usage, like copying
large files, or when opening a demanding chrome web pages (due to swaping?).
It happens on Ext4, Btrfs and XFS, so file system doesn't matter.
It happens on both Gnome and Xfce, so that also doesn't matter. 
Windows 10, Fedora and Ubuntu works almost fine on the same device, it's a
problem with Leap 15.2 only. So I upgraded my system from Leap 15.2 to TW, and
everything works almost fine now. 
I booted my device to TW but with Leap kernel (5.3.18-lp152.44-default), and
the freezes happen again. 
So it seems to me that's a kernel issue. My search lead me to multiple cases
with the same issue (different distros).
See: https://askubuntu.com/questions/1212736/system-freezes-on-disk-i-o
And: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1861359
It seems like newer kernel have this issue fixed, maybe version 5.5.6 (as
stated  in the link), and it seems that Ubuntu backported successfully a fix to
kernel 5.4.
This issue is very annoying, I hope openSUSE can backport a fix from upstream.  

Reproducible: Always

Steps to Reproduce:
1. Start a disk demanding process, like copying large files
Actual Results:  
Freezes and a laggy mouse cursor 

Expected Results:  
Smooth system

Maybe it could be more obvious in devices with low ram, but Ubuntu 20.04 and
Windows 10 work perfectly on the same device.