https://bugs.winehq.org/show_bug.cgi?id=54769
--- Comment #2 from Austin English austinenglish@gmail.com --- Please run a regression test: https://wiki.winehq.org/Regression_Testing
Given that there seem to be multiple issues, I'd suggest focusing on bisecting which commit makes it take so much longer to start.
That commit may or may not be the same commit that caused the black screen. If it's not, a second bisect/bug report will be needed.