APC exists because PHP reloaded source files each time a script was executed through your webserver. No such parallel exists in Ruby; once source files are loaded in a process, they stay loaded for that process.<p>In theory it might allow for faster loading of Ruby code (more analogous to Python&#x27;s .pyc files), but IIRC early experiments (in the early 2.0 days) showed it to be counterproductive in many cases.