As discussed with @szafranek, loading times for the TypeKit are a performance concern. TypeKit offers performance optimizations that we haven't yet taken advantage of. Let's figure out whether they decrease loading times to a negligible quantity:
Increasing cache times: https://helpx.adobe.com/typekit/using/optimizing-performance.html
Advanced loading with custom logic: https://helpx.adobe.com/typekit/using/embed-codes.html (See Advanced Embed Code)