Optimising the Dart VM, performance cliffs, and the amazing number of string representations in V8:
miniblog.
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A great deep dive on building GitHub's code view, optimising React, scaling to thousands whilst supporting both Ctrl-F and syntax highlighting:
Optimising GHC, implementing assembly pretty-printers, and the tradeoffs of implementing against an interface: https://www.tweag.io/blog/2022-12-22-making-ghc-faster-at-emitting-code/
Interpreters versus compilers as a spectrum, and a fun worked example of optimising Brainfuck: