A Few Vyrs Questions

I have my wiz in a pretty good place and really enjoy playing archon.
1 - speedfarming? would i just switch furnace for an en-geom or something like that? doesn’t seem to be much else to improve the speed of the build.
2 - minimum CDR needs? i sit at aound 50-55 depending on my gear…still trying ot get it on a good weapon. i dont really sit outside of archon that long and im not having issues at my current 52%. just wanted to know if there was a general consensus about what was needed.
3 - IAS - should i be going for this over CDR? any sort of number im trying to hit? im currently at like 1.9 asp.