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Feb 24, 2015 at 19:50
Optimising let in JS: http://t.co/uh2zrYgk5E It's a shame that users need to consider which compilation tiers support their fave features.

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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/
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