I upgraded to 6.10.0-rc1 a few days ago and I have been having some issues with the webUI becoming very slow to load and unresponsive. It will take 10-15 seconds for the page to fully load and become functional. The same behavior happens on the Main array tab, the other main pages seem to be unaffected. The problem seems to come and go at random; sometime later it will resolve itself and then be back again a few hours later.
I'm using Firefox 92.0, I have my ad-blockers and similar disabled for my unraid pages. I haven't tried any other browsers to see if it is Firefox specific, but it started with my 6.10.0-rc1. I assume it's probably has to do with the webUI changes that came with 6.10.0-rc1.
I can't seem to find any reason for the sluggish behavior. At first it seemed like it only happened when I had some drives spun down, but that doesn't seem to be the case anymore. It's not correlated with a heavy CPU load or low RAM availability.
I have attached some screenshots to show what it looks like before loading fully.
I also attached my diagnostics, let me know if there is any other info you need.