High Level + Multithreading + GUI + Crossplatform ?

Question

Programming

I choose a programming language. According to the requirements above, python is almost suitable, but it does not have quite the "multithreading" that I would like, I would like an increase in speed from it. The language is needed mainly for fast work with the network, databases.

Answer 1

As for the bases in general, in fact, the language is not the most important thing.
The world's most powerful number cruncher.
And so everywhere their "+" their minuses. C# will be really fast in a lot of threading, but it is demanding and gluttonous.
In fact, everything rests on computing power. And so you can integrate the same python into a distributed grid and get better results and stability.
Do not forget about stability, especially if you plan to squeeze the max.

Answer 2

Java, C# (Mono), D, golang.
It is not entirely clear what exactly you did not like about python multithreading.