A Broken Heart
Summary
Allen Pike details a slow-loading Safari issue traced to emoji font rendering, discovered via performance profiling and binary search. The culprit is Noto Color Emoji combined with COLRv1, causing extreme layout times; removing the emoji yields instant layouts, while re-adding it reintroduces the slowdown. The post ends with practical guidance on reproducing browser bugs and a recommendation to prefer Apple Color Emoji on Apple platforms until the bug is fixed.