I've had upgrades that have higher CPU usage for a surprisingly long time. I mean I could literally look at the graph and see higher usage for a day or more. But it's dropped back down every time, eventually. I haven't figured out if it's just a reinforcement bias on my part. Maybe I'm looking extra-closely after an upgrade and am more sensitive. Maybe I have extended runs of elevated CPU at other times, but it just doesn't register in my mind.
I've also wondered if it's maybe a bug related to existing patterns that works itself out after a pattern update. Or I've thought that I use an XGS87, which is bottom-of-the-line and maybe I'm using the GUI a lot right after an upgrade and it might be doing some housekeeping, etc, and...
Anyhow, in my case I've seen a jump from 10%-ish to 20-25%-ish that lasted overnight or even a day (maybe two) but in the end things fall back to the usual range. Right now, my average is 11% on v19 EAP1.
