Continued improvements in rustc's compile times! I'm impressed they haven't reached the point of diminishing returns yet.
https://blog.mozilla.org/nnethercote/2020/04/24/how-to-speed-up-the-rust-compiler-in-2020/
miniblog.
Related Posts
Measuring Go program (GoAWK) performance from 1.2 to 1.18: https://benhoyt.com/writings/go-version-performance/
The Go 1.3 runtime led to a 2x speedup in GoAWK, and performance wins have continued since. It's easy to see popular PLs as largely finished, but the wins here show there's still opportunities.
Smart devices that have continued despite the original company ceasing: https://www.engadget.com/2020-03-03-undead-gadgets.html
The secret seems to be a great developer ecosystem, a cute form factor, or a cult following.
How Tumblr has developed over time, the importance of continued attention by the developers, and the community consequences of seemingly minor features:
