there's been almost twenty years of work on optimizing javascript engines with JIT and complex heuristic-based GC and a wealth of feature-rich profiling and analysis tools and validation and testing frameworks for deployment and integration and syntax improvements and functional and higher-order primitives and serverside transpiled code. and it's all enabled some amazing new stuff, for example github now takes 10 seconds to display a plain text file, and you cant search properly anymore
@jk obligatory reminder https://www.webperf.tips/tip/cached-js-misconceptions/