Check out a free preview of the full Responsive Typography course:
The "Performance" Lesson is part of the full, Responsive Typography course featured in this preview video. Here's what you'd learn in this lesson:
Each font has a performance cost. You want to make sure you are only loading what you need. Proper implementation and performance will help avoid a FOUT (Flash of Unstyled Text). Jason explains how the Google Web Font loader can alleviate issues.