What are the pros and cons of running IIS as 32bit vs 64bit on a 64bit OS?

Question

Possibly better suited for \"Rack Overflow\", but from a developer\'s point of view, what are the advantages and disadvantages of running IIS (serving both legacy classic AS

Answer 1

I don't think you've made any false assumptions. But I'd say, no, there's likely to be no performance difference between any of the scenarios you outlined. 32 on 64 on Windows does not operate at a penalty. 64 on 64 may give some slight performance boost, but that's dubious. There may be some memory savings with a 32-bit process, but this is likely negated by the thunking required to run the process in the first place.

The only benefit is the DLL issue you mentioned. That could be a reason for upgrading as well (if you have something specifically 64-bit that you need to use).