Search for benchmarks and https://www.youtube.com/watch?v=xbdVs4FhZac to see performance comparisons.
https://github.com/kostya/benchmarks
As always, take benchmarks with a graint of salt. We use benchmarks mostly to know how far away we are from C (1x, 10x, 100x, etc.), so any language that has a speed "in the order of" C is good enough for us, small differences don't matter much.