That would have been my guess too, but the author of Moo had a similar experience e.g.
I've tried several times to use Mouse but it's 3x the size of Moo and takes longer to load than most of my Moo based CGI scripts take to run.
That's from https://metacpan.org/pod/release/HAARG/Moo-1.007000/lib/Moo.pm#WHY-MOO-EXISTS

In reply to Re^5: Any gotchas with CGI and Mouse running together? by Arunbear
in thread Any gotchas with CGI and Mouse running together? by kcott

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