I thought I should mention this.
I work mainly in 4K, very simple single video track with 5 or 6 audio tracks. Lots of edits. Windows 11 / i9 13900K / 128Gb DDR5
in 21 I really had to use Proxies (Otter) in order to get a decent workflow
But in v22 there is a marked improvement, and almost no need (in my case) for proxies.
Also render speed (using Voukoder) seems to be very much improved.
Thank you, team.