My site uses custom fonts and they're probably loaded naively. I want text to render fast without flashes of invisible or swapped text. Audit and fix: 1. Font inventory: which families, weights, and styles am I actually loading versus actually using? Remove unused weights and styles. Loading six weights to use two is common waste. 2. Font format: serve modern formats (woff2) and drop legacy formats unless I have a specific compatibility need. 3. Display behavior: ensure font-display is set (swap is the sane default for body text) so text renders in a fallback font immediately instead of staying invisible while fonts download. 4. Preload the one or two font files needed for above-the-fold text. Don't preload everything; preloading the wrong thing is worse than not preloading. 5. Self-hosting vs CDN: if I'm pulling fonts from a third-party host (Google Fonts, Adobe), consider self-hosting the subset I use to remove a render-blocking external connection. If my current setup is fine, tell me why and skip it. 6. Fallback metrics: pick fallback fonts with similar metrics (or use size-adjust overrides where supported) so the swap doesn't make the layout jump. Subset fonts to the character ranges I actually use if the files are large. When done, verify: no render-blocking font requests in the waterfall, no invisible-text period, and the before/after font payload size.