C++ performance is a true minefield between different compilers and their versions. For example, fail to provide correct incantation of compiler flags or do som

C++ performance is a true minefield between different compilers and their versions. For example, fail to provide correct incantation of compiler flags or do something in code that confuses auto-vectorization, and your performance can suffer by an order of magnitude. I guess a lot of Javascript micro-optimization comes down to don't change field type and give type hints in assignments. Like: var integerType = 0|0; integerType = 45|0; integerType = (integerType + 1)|0; That '|0' tells the Javascript VM that you have integer as real data type. If you'd suddenly assign 'integerType = 5.1;' or 'integerType = "string";', the built in guards would make the JIT compiled native code to fail and the Javascript engine would fall back to interpreting. Emscripten can be used to compile C++ into Javascript. Perhaps it could help you?