Here's another example.  After posting my comment I minimized the Chrome browser.  Seevral minutes later and my desktop has yet to appear.  No explorer, Start Menu, etc., but my hard drive light  is flashing, sometimes pegged, indication Windows is up to something.

Gevansmd,

When I upgraded to 1903 I had the same issue (though not as dramatic).  I decided to nuke my hard drive and start from scratch.  1903 non-upgraded runs much, much better than an upgrade of 1903 in my opinion.

Have you told Windowblinds to allow it?  By default we block it now.  See advanced settings in WB to allow.

I rebooted after my last post and discovered Windows was still installing stuff.  That's why everything was so slow.  At shutodown it said it was installing updates and maybe at restart as well, I've forgotten. It's faster now although still slower than before the upgrade.