Golang ;)
Our e2e test with Cypress take about 1.5 hours, but with parallelisation we get this down to about 10 minutes, half of which is setting up the Docker environment.
semantic passes duration: 0 min(s), 0 sec(s), 272 msec(s)
irgen pass duration: 0 min(s), 2 sec(s), 431 msec(s)
linking duration: 0 min(s), 0 sec(s), 70 msec(s)
for 25kslocs.
And server uses esbuild, happens under a second