> V8 excels at a subset of dynamic JavaScript (namely those benefit from Crankshaft) and is not very good outside of the subset As I understand it Crankshaft's

> V8 excels at a subset of dynamic JavaScript (namely those benefit from Crankshaft) and is not very good outside of the subset As I understand it Crankshaft's claim to fame is the runtime type specialization, which does well if the code is hot and ends up using same types in all cases. Is this what you are referring to?