Did you set the correct block size for your disk? Especially modern SSDs like to pretend they have 512B sectors for some compatibility reason, while the hardware can only do 4k sectors. Make sure to set ashift=12
.
Proxmox also uses a very small volblocksize by default. This mostly applies to RAIDz, but try using a higher value like 64k. (Default on Proxmox is 8k or 16k on newer versions)
https://discourse.practicalzfs.com/t/psa-raidz2-proxmox-efficiency-performance/1694
From my testing of the Wayland backend when it was still hidden behind a registry setting, it’s mainly for DPI awareness. For example, I use a 1440p screen with 1.25 scaling. Currently Wine through Xorg therefor sees my desktop as 1152p high. With the Wayland driver it would still correctly identify as using a 1440p screen.