Is C++ Really This SLOW in Unreal 4?

Right now I’m using CLion on macOS and it’s way better than Xcode when it comes to indexing a large codebase. Autocompletion is quick and works very well. I noticed in the release log of 4.15 that it says that compilation times are 50% faster than before but I guess it’s for the engine itself only as compiling the game code is still taking the same time.
Did you guys notice any difference?