[terio]

I find it funny that when I had to switch to C++ I found it slow compared to C and Object-Oriented Pascal.

There are also some tradeoffs when switching languages. Some people would never make the move from C to C++ citing unnecessary complexity (e.g. Linus Torvald).

This is essentially a question of having the right tool for the job. Switching from C++ to Go is probably a good decision some cases and a bad one in others. But one should not remain so anchored in one language that won't be able to consider some other, probably better, option.