I think that the "which is the fastest" question is the wrong one to ask. Any time somebody says Go is faster than Java or viceversa, there are other people that show other benchmarks proving the contrary. What is really important "How fast they process some logic" or "How fast can I code something and how easy is to understand and maintain something coded by somebody else?". I think the latter is much more important since it is the place most of the money get spent. So, in this light, which is the most efficient language to code stuff, I mean normal corporate DB/Rest oriented stuff? Any organization may have its own answer, but I think this is the question to ask.