It does seem a bit harsh, but I would put it like this: If you need to care about performance, then this is an extremely basic difference between the two langua

It does seem a bit harsh, but I would put it like this: If you need to care about performance, then this is an extremely basic difference between the two language implementations that should not surprise you. If you don’t yet, then this is the very beginning of your education in how to care about performance—welcome to the next level!