I’ve noticed on the latest update (14.0.0.2856) that the F5 Preview window is taking about twice as long to open than in previous builds. The Preview window used to open in about 5 seconds. Now it’s taking about 10 seconds to open.
With the last update we have further reduced the exported font size, but this takes more time. Part of it is due to the way we optimize OpenType layout features. That can be disabled, but we might make it mandatory in a future release.
Thanks Erwin! That did the trick! 