Bug Report

when $rectorConfig->importNames(); is enabled running rector across the otherwise identical codebase is 42% slower.

is it a known problem that $rectorConfig->importNames() is such a performance hit?

do we actually need $rectorConfig->importNames() in our projects when we run ECS right after we ran rector?

Minimal PHP Code Causing Issue

my rector command on the kunzmann private repo:

blackfire run php vendor/bin/rector process app/admin --ansi --clear-cache

config

$rectorConfig->importNames();
$rectorConfig->disableParallel();

Expected Behaviour

fast CI :)