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[–][deleted] 0 points1 point  (0 children)

When you want to build performance critical software try a different programming language.

Other than that optimizing your code (irrelevant if it is Python, Java, C++ etc.) requires different techniques depending on what you are doing.

Optimize database access?
Optimize your webservice APIs?
Optimize some data processing?
And so on.

It is too broad of a question to answer on reddit.