How to turn on optimization in qt??

[ChrisW67]

Build it in release mode and the check the compiler commands... at least for my GCC toolchain the -O2 flag is already specified. If you really need/want to add to/change that you can use the QMAKE_CXXFLAGS_RELEASE qmake variable.

[tonylin0826]

That is what I am asking for. Thanks a lot. )

[cya-st]

Even you can use mingw32-make -j{COUNT_CORE}