Even if you're compiling code that you work on all the time changing a compile flag can invalidate all your ccache files. Having to wait 10 seconds instead of 3

Even if you're compiling code that you work on all the time changing a compile flag can invalidate all your ccache files. Having to wait 10 seconds instead of 30 for the new compile to finish can make a big difference when you want to be able to test changes quickly.