I just replied in another thread about a possible (nasty) workaround I found and have set up. This temporary solution works very well for me, although I do not expect to everyone like it. It simply adds another container for syncing changes from the mount to the application folder.
https://forums.docker.com/t/how-to-speed-up-shared-folders/9322/15?u=sveneisenschmidt
I am very optimistic about the Docker people fixing this problem and I can live with a sync container for some time.