D compilation speed vs. go

[Walter Bright]

Robert Clipsham wrote:
> It's a shame I can't make it to ACCU next week, I'd love to see your 
> compiler construction session, if only for a few insights into how you 
> managed this! Do you have any tips for keeping compilation speedy, or is 
> it just a process of profiling and experience to find what works best?

Lots of time spent with a profiler.