I've noticed it as well. I think when we were on 19.3, it was running pretty well, but after upgrading to 19.4 and 19.5 it's been fairly slow, and has gone out for a few minutes at a time (I'm on Voyager, for reference).
I haven't been on other instances enough to say if its a widespread thing, though.
There's actually a term for that phenomenon: the Preparedness Paradox.