↑ ↑ ↑ ✔
I just installed version Windows 4.32 32 bit, sits on 0.0% with an occasional blip to 0.2% -- even if I start it with a 180,000 book library.
You might also want to try starting calibre in safe mode, badly behaved shell extensions can mess with other programs. I had one once that decided to send Sigil into lockdown, and that gave me the impetus to find an alternative (File Menu Tools).
BR
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