Comment by azylman

This isn't really true, some languages handle I/O much better than other languages. We migrated a Python application to Go that was about as simple as you can get and mostly blocked by I/O (call DB, transform storage format to Thrift, respond to caller with Thrift) and saw SUBSTANTIAL improvements in performance. Approximately 40% improvement in p99 latency and, more notably, 15x improvement in throughput.