This aligns with my (albeit limited) experience with TypeKit. The only client project where I was forced to use it, was to appease the design agency who insist

This aligns with my (albeit limited) experience with TypeKit. The only client project where I was forced to use it, was to appease the design agency who insisted on their font package being used. I still see (naked eye) a noticeable lag or hesitation when that website loads.