Please review the webrev at: http://cr.openjdk.java.net/~skuksenko/jsr335/8024635/webrev.00/
MethodType.toMethodDescriptorString() is frequently invoked when generating lambda classes from InnerClassLambdaMetafactory. Caching resulting string into the field of MethodType gives +5% - +10% to lambda linkage performance. Minor performance improvement: private method "checkPtype" was inlined and eliminated. "checkRtype" and "checkPtypes" were refactored for better perfomance in HotSpot interpreter (important for lambda linkage). overall result +1%. -- Best regards, Sergey Kuksenko
