Swift 5.4 and 5.5 made some major improvements to incremental builds (rebuilding fewer files after a change) and pretty much every release since 5.1 or so impro

Swift 5.4 and 5.5 made some major improvements to incremental builds (rebuilding fewer files after a change) and pretty much every release since 5.1 or so improved full module rebuild performance (doing less work for a file that actually has to be rebuild). But it can be hard to perceive small cumulative improvements when everyone’s codebase keeps getting larger as well.