Hey 
I agree with @josh10. If you have a Mac with 4 GB of memory it’s going to be really hard to use Bubble. Hopefully with the improvements over the next few weeks it should get better.
In the time being you can remove the error checker to speed things up a little bit. Have you tried that yet?
To remove the issue checker you should be able to just add this to the URL:
&issues_off=true
Hope that helps! 
@luke2 and I had the same idea! 