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Jan 13, 2023 at 01:26
Interpreters versus compilers as a spectrum, and a fun worked example of optimising Brainfuck:
Laurence Tratt: Compiled and Interpreted Languages: Two Ways of Saying Tomato

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Jul 9, 2023 at 02:25
A great deep dive on building GitHub's code view, optimising React, scaling to thousands whilst supporting both Ctrl-F and syntax highlighting:
Crafting a better, faster code view
Crafting a better, faster code view
The new GitHub Code View brings users many new features to improve the code reading and exploration experiences, and we overcame a number of unique technical hurdles in order to deliver those features without compromising performance.
May 17, 2023 at 05:05
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/
May 22, 2022 at 23:14
It's strange how AOT compilers usually have different modes for optimising time or space usage, but JITs rarely have modes like "prefer fast startup". The vast majority of JITs seem to focus on runtime of hot code after warming up.