JSC has had a set of large metabenchmarks like JetStream2 for a while. We have been the fastest for a while but V8 is gaining, so the current advantage is significant but not earth shattering.

The last time V8 had their own benchmark, they retired it right after we beat them on it and made a post saying that benchmarks are bad because people cheat on them.

Around that time I stopped seeing google.com claim that I should switch to Chrome “because it’s faster”.

So basically JSC is fast enough to have made V8 ragequit benchmarking. Hope that answers your question!