What's "Everything" doing?

I just found Everything using most of one of my cores, after leaving the
machine unattended - but on - for some hours. It showed in task manager
as using 2x% of CPU (Task Manager thinks I have four cores), and when I
shut it down (via the tray icon, not from Task Manager), CPUsage went
back to idle.

I've just reopened Everything (once I have opened it, I normally leave
it open, as it's so useful), and (after initial peak) it's sitting there
down at near enough zero CPU usage again.

I've noticed this behaviour more than once recently. Anyone know what
it's doing? FWIW, it's "Version 1.4.1.895 (x86)".

(Hour or two later: it's still down in the 00 usage.)
--
J. P. Gilliver. UMRA: 1960/1985 MB++G()AL-IS-Ch++(p)Ar@T+H+Sh0!:`)DNAf

A man is not contemptible because he thinks science explains everything, and a
man is not contemptible because he doesn't. - Howard Jacobson, in Radio Times
2010/1/23-29.