https://github.com/D-Programming-Language/dmd/blob/master/src/root/stringtable.c#L21
Profiling shows the calcHash function is a significant contributor to compilation time (3.25% of total time). So making it faster is a win. Even making dmd 1% faster would be a nice win - all those little drops add up.
There are many, many string hash functions findable through google. Anyone want to spend the effort to make a faster one? Remember, ya gotta prove it's faster!
A nice timing test would be the time expending compiling Phobos. I would suggest that the 64 bit build of dmd be used for timing tests.
Also, be careful, many of those hash functions on the intarnets have a license that makes it unusable for dmd.
