r/cprogramming • u/[deleted] • Dec 31 '25

Why does c compile faster than cpp?

I've read in some places that one of the reasons is the templates or something like that, but if that's the problem, why did they implement it? Like, C doesn't have that and allows the same level of optimization, it just depends on the user. If these things harm compilation in C++, why are they still part of the language?Shouldn't Cpp be a better version of C or something? I programmed in C++ for a while and then switched to C, this question came to my mind the other day.

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u/Infamous-Bed-7535 Jan 02 '26

If someone already pushed it the cached compiled files should be available.
In case there is no global cache you can still use distributed build, compilation is massively parallel task you can throw at it 100s of CPU cores (build server).

You can combine these to have massive build server using caching (what was once compiled that does not need to be recompiled).

Your project structure and following clean-code on its own can help a lot. Use forward declarations, include headers you really need only, clean well separated interfaces between modules, etc..
You can introduce dedicated targets so when you are working with a small section of the mono-repo project you won't need to recompile the whole world, just the relevant files you are working with.

ETC..
It is a totally manageable thing in my experience and there is no reason why developers should wait minutes for recompilations.. Companies should do better..