Just pushed build 113. Included in this update:

• Checklist optimization: Long running spells can no longer slow down the rest of the editor.
  
• Editing improvements: Replacing a word in the middle of your spell will no longer remove everything below. This makes it easier to replace similar words while building up your spells. See the gif for an example.
  

I have a few more editor improvements planned, then I'll swap back to working on content for a while.

Enjoy!