if you are using the new keyclone cpu affinity, and find the fps kind of low, be aware of the maxfps and maxfpsbk.

if you are using a single wow folder, and had set the maxfps or maxfpsbk at one time, that same setting would still be used for every instance.

if using a keyclone command, to be certain, set the maxfps and maxfpsbk to something over 40 (999 would mean 'as many fps as possible')

otherwise, find and edit your config.wtf and look for those fields.