Your choice of top level domain (e.g. .com vs .biz) can really affect the performance of your first page load! https://bunnycdn.com/blog/is-your-fancy-new-domain-hurting-your-performance-gtld-benchmark/
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It's really satisfying to use a profiler for the first time on a project. I always find a big performance win with only a small code change.
It's never the code that I expected to be slow, however!
It's so strange that we talk about languages being slow, and have done for years. Computer performance has increased so much in this time.
https://hbfs.wordpress.com/2009/11/10/is-python-slow/ (shared on HN in 2009) discusses Python being slow. My underpowered Thinkpad has 20x the single-threaded performance! https://www.cpubenchmark.net/compare/73vs3766/AMD-Athlon-64-4000+-vs-AMD-Ryzen-5-PRO-4650U
Maybe *relative* performance of languages matters more?
It's rare to see ANSI escape codes for URLs in the wild, but cargo has it!
This example links to https://doc.rust-lang.org/cargo/reference/profiles.html#default-profiles, describing the different profiles.
Considering releases vs debug is a source of confusion for new users expecting better performance, this seems wise.