This is a question for Emacs users on macOS 10.14 (Mojave). Since upgrading to Mojave and recompiling Emacs with the display patches, I’m seeing a delay of about 5 or 6 seconds when I invoke Safari from Emacs. This happens, for example, when I follow a link from Org-mode with Ctrl+c Ctrl+o or from Elfeed when I call the original Web page with a b.
The delay is significantly less if I start Emacs with -q so this probably means that there’s some interaction with one of my Elpa packages. Before I invest a bunch of time trying to figure out which package (if any) is causing the problem, I thought I’d query Irreal readers to see if anyone else is experiencing this and if so have they found a solution.
The problem started when I recompiled Emacs from the 26.1 branch and has continued now that I’m on the 26.1.90 pretest. If you have any wisdom to share, please leave a comment. Comments of the sort, “I’m using Emacs on Mojave and not seeing the problem” are also useful.