I have a project that I updated to 3.4 official release on wednesday and in the process of updating I also updated some packages. The app started loading changes very slowly, it took 2200ms to show changes in the browser while before it took max 300ms.
I have narrowed down the issue to the update of @rspack/core to v1.7.4 before it was at v1.7.2.
@nachocodoner this might be something that you might encounter in the future with more people using this version of the package.
Ill try to make a reproduction repo later today or tomorrow so that is easier to replicate the issue.