Google Fonts only lets you download .ttf files meaning that if you want to self-host your fonts (and you should), you have to first convert them to .woff2 files.
Luckily this tool has been online for over a decade, doing what Google Fonts should be doing by default.
A no-nonsense checklist of good performance advice from Karolina.
This is an interesting project to try to rank web hosts by performance:
Real-world server response (Time to First Byte) latencies, as experienced by real-world users navigating the web.
Harry takes a deep dive into the performance metric of “time to first byte”, or TTFB if you using initialisms that take as long to say as the thing they’re abbreviating.
This makes a great companion piece to Drew’s article on server timing headers.
@font-face for all — Ted shows how to convert TTF files to EOT using the command line.