Set ShowTagSelector property to false

 

Demo:

 

 

 

>>Why can't you fix V6 so that it performs like 5.3 did?

 

Your document is extremely long which causes the new feature tag detector take long time to parse. You can just disable this new version. It will work like version 5.3.

 

Or you can just use version 5.3 instead of version 6.0.