https://github.com/vector-im/element-web/issues/20431
https://github.com/vector-im/element-web/issues/20143
I think the reason you don't see log reports here is that a condition for this to be problematic is large number of rooms/DMs. We could audit/edit the logs and submit them manually (and perhaps I'll get around to that). I also suspect high-intensity users are more likely to disable telemetry.
Just putting out a possible explanation why this issue may be more prominent than can be gathered from analytics. You do seem to recognize the common complaints of slowness (the dismissal of which prompted me to follow up in the first place), and there is at least one GitHub issue open by prominent community members since ~6 months.
It would be more honest to say something like "element-desktop works great on macOS and keeps improving on all platforms", rather than pretending like anyone with issues is an edge case. Could it be that you, who work closely to the product, are more of an edge case?
We all have our blind spots.
If you have time at some point, maybe spin up an Ubuntu/Fedora/whatever VM, install element-desktop, sign in to your account and try to use that as your desktop driver for two weeks. Should be straight-forward enough on a Mac. It needs to be with your largest account. Consider it a challenge.
So whatever is going wrong here is presumably a Linux-specific bug on Element Desktop, which I'm unaware of, and haven't heard from any of the other linux Element Desktop users. Have you filed an issue with logs to get it on our radar? HN is not our bug tracker...