[quote:1c0lqoyl]How to deactivate this?
I think this is the problem vor memory waringings and app crashed and slowdowns.
I had this problem too. I don't think you can turn it off but you can significantly decrease the time it takes to complete.
If you're still having this problem turn off WebGL before you export. Then when you switch layouts you'll still get a slight pause on first load but after that it will switch very quickly.
At least this method worked for me. It may also help to reduce your quality settings. But by far WebGL was the biggest culprit with my project.