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I defer to Zach Letherman on all things font performance. He's dug into this stuff more than anyone else I know. See:

• zachleat.com/web/comprehensive-webfonts
• https://www.zachleat.com/web/critical-webfonts/
• https://www.filamentgroup.com/lab/font-events.html

He even looked at each presidential candidate's websites and ranked them based on how well their fonts performed: https://www.zachleat.com/web/president-web-font/

It's extremely heartening to see organizations taking performance seriously. For instance, the team at Vox declared performance bankruptcy (product.voxmedia.com/2015/5/6/8561867/declaring-p…), and have been sharing their updates as they fix issues. That includes improvements to how they handle their fonts: product.voxmedia.com/2015/8/13/9143805/performanc…

I'm not sure of font-specific tools out there, but Web Page Test is a fantastic tool for all things performance: https://www.webpagetest.org/

Hope this helps!