[dillondoyle]

And I wonder what speed tradeoff there will be for commonly cached/repeated fonts like Roboto, like maybe only makes since to inline less common fonts

[capevace]

AFAIK Google Fonts doesn’t allow browsers to cache the fonts for tracking purposes...

[partiallypro]

They do browser caching, but it's not as long as many would like for a static resource like a font. There is no proof they use Google Fonts for tracking, though, it's entirely possible they'll use it for that in the future...but I don't see a reason for them to do so. Google Analytics is already on most websites.