Goto considered harmful
Jquery .show ()/.hide () is now biggest performance drain in some SPAS
Node callbacks now harmful, async/await or promises could be next... possibly
React is so slow it cannot render > 10 fps for some SPA Windowpadder.ahk, Launchy, allsnap
taekwindow, Virtuawin, dexpot
Fun fact: types, line numbers, and BS keywords like 'let' 'var' and * *&uint32, are only constructs of the language authors mind... a visualization of how he thinks. And are completely optional to a language (given a slightly more flexible parsercompiler)