[bobbylarrybobby]

I think v1.9 is where most of the magic happened there — packages gained the ability to list out their precompilation work during installation, which reduced compilation (and associated invalidations) at runtime.

[adgjlsfhk1]

1.10 had some substantial `using` time improvements (roughly 2-3x) from just hunting down lots of the slow parts in the compiler and fixing them.