Em dashes were making http://claude.ai slow. Real, measurable milliseconds. And Claude was the one that caught it. Anthropic just published how they made their app 3x faster in two weeks, and the wildest detail is buried in the middle. During a sweep for CPU hitches, Claude noticed that highlighting a finished code block could freeze the page for a full second. It traced the cause to punctuation. If a reply contained even one character outside Latin-1, like an em dash or a curly quote, V8…

@2d ago

We made claude​.ai 3x faster in two weeks. Here’s how we use Claude to measure, debug and improve performance. Prompts and methods included. https://t.co/mgvK8mJRuD