Hi,
Do you get the same result when loading http://allnarfedup.com/ ? (I'm using Custom Fonts on my blog, but haven't noticed the TypeKit JavaScript loading slowly for me. I use Google Chrome 22.0.1229.94, Safari 6.0.1, and Mozilla Firefox 16.0.1.)
If you do, can you let me know which resources are loading slowly in Google Chrome (with Developer Tools), and upload a screenshot of the results to your Media Library?