miniblog.

I've been impressed with code written by Fable in my testing: Difftastic: found small optimisations in a hot loop I'd already profiled extensively. Helped me prototype Dijkstra to A* too (hard to find a good heuristic). Garden: Found some real bugs in my simplistic typechecker.

I tried replace Vec with SmallVec in a really hot loop in difftastic, and it's a huge speedup. It almost *halved* the runtime of one of my test files! I've done a lot of performance tuning of difftastic, so it's surprising to see such a big win. https://crates.io/crates/smallvec

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.