It's better on the PC version. The fundamental problem is, that with every additional metal, every family takes more time to check out the market. I will either reduce the pace of unlocking metals or modify the market trading algorithm to make less comparisions.
one thing that might help is to spread some of the heavier loops over multiple frames.
by limiting the number of iterations of a loop that are allowed to run per frame you should be able to keep frame rate at a somewhat acceptable level. (while this doesn't speed up the market checking, I think the slowdown could be passed off as a natural trade-off to being an advanced civilization)