I know and that you take special care to bulk as much stuff to it for lower overhead. But then how much of % speed is left into GO ? Say GO is 2x slower, and the db is bottlenecked on cpu/ram, you're using 2x servers. While if it's bottlenecked on disk it's rocksdb which you can't make faster by using a different language.

Like even TiDB (mysql protocol, golang) uses TiKB (kv in rust,rocksdb) to make it faster.