CTFE slower than expected

[Manu]

I've been trying to work out why my compile times have gone to hell
recently.

I have a lib, it takes 3.5 seconds to compile.
I add one CTFE heavy module, it's not huge, certainly much smaller than the
rest of the app, and it blows out to 18 seconds. I've done some experiments
removing bits and pieces of code, I can isolate the bits that add seconds
to the compile time, but the big offenders are one-line mixins which use
CTFE fairly aggressively to generate the strings they mix in.

Can anyone comment on CTFE as implemented? Why is it so slow? It's
certainly not executing a lot of code. I can imagine executing the same
routine in an interpreted language like lua would take milliseconds or
less, not multiple seconds.
What are the bottlenecks? Is there any way to improve it?
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