This is correct, I would highly highly recommend reading &quot;Deoptimizing Ruby&quot; available here, <a href="http:&#x2F;&#x2F;chrisseaton.com&#x2F;rubytruffle&#x2F;deoptimizing&#x2F;" rel="nofollow">http:&#x2F;&#x2F;chrisseaton.com&#x2F;rubytruffle&#x2F;deoptimizing&#x2F;</a> for more information on WHY making Ruby fast is hard and what the Truffle+Graal does to make it fast.