Hi again, Trying out the new 28 EA build.
The project I was doodling on was a 1-1 translation of the parser library from the Elm language ( https://package.elm-lang.org/packages/elm/parser/latest/) I made an example program parsing a big text file of points [ (1, 2) ; (4, 1);(34,11) ] After switching all the records to value classes I see a consistent slowdown Before Value Classes PT7.275514833S PT6.425502792S PT6.3636795S PT6.386459292S PT6.617603334S PT6.635160292S PT6.653826292S PT6.593240083S PT6.601129208S PT6.606801584S After Value Classes PT7.736279333S PT7.196870292S PT7.315497417S PT7.232062125S PT7.285313833S PT7.235185834S PT7.199234042S PT7.174771S PT7.224577666S PT7.185029042S Repo and hastily constructed demo are here https://github.com/bowbahdoe/elm-parser-java
