Simple yet important tip for passing std::string by reference.

Using C++ I quickly learned that I should pass large std::vector by reference.

Passing a std::vector by reference (using &) as a parameter for a function will save you from the operation of copying the std::vector into a local copy.

For my next game I was getting bad performance parsing jsons.

It turns out that nearly the entire CPU time spent on parsing the json was due to passing std::string by value in internal functions.

Passing std::string by reference will save you from a copy operation of that string.

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