Is it just me or Playground on Mac is super slow and unresponsive (keeps running forever, and deleting the Derived Data folder doesn't help)? Also, on both Mac and iPad Playgrounds it is super fragile. Even though the code works fine, it returns an error: "There was a problem encountered while running this playground. Check your code for mistakes", which is totally unhelpful.
It seems like a Playground Page live view can handle only a certain number of views.
Playgrounds can sometimes be incredibly stressful to work with for me, and sometimes just plain slow. I would love to hear your experiences and if this has ever happened to you!