Am sure others are still seeing slow down effects like me. Pages sometimes are slow loading or timeout, with Cloudflare reporting it's a "server" issue (error report code 522), but usually get past it by just refreshing the page through my browser and trying to be patient.
Still a few sporadically weird times when Attachment Manager picture thumbnails don't properly display. I get some that display while others show the picture link, but if refreshed may change to all thumbnails or change which thumbnails display.
Note - If you are posting and/or attaching pictures, let the post or attachment process complete before changing the page or hitting the "POST" button. If you do it too soon, sometimes the post or attachment process fails and you may have to do it again.