I am using ClassFinder in my project Lighthouse for a CLI tool, see https://github.com/nuwave/lighthouse/blob/35b852063d1368d479ff14198067e1fa7cef17a7/src/Console/IdeHelperCommand.php#L78 Issuing the command causes 5 calls to ClassFinder and totals ~2 minutes on my machine. Most of that time is spent in calls to `is_dir` and `scan_dir`:  Would you be interested in collaborating on improving the performance? ClassFinder has been really helpful to me, there is nothing quite like it.