Playing around with it some yesterday evening shows that the startup times have gone back to normal; leaving Calibre active for a while and then quitting it no longer gives me a multi-minute 'startup time'. Copying my settings from another Calibre install also fixed the tag browser opening on startup-issue, so it looks like Calibre isn't updating some setting file correctly. I excluded my settings directory from Defender, but that didn't help.
I'll play with it some more this evening.
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