[OPEN] Moving items from one tree panel to another is very slow

1. 
   

   You found a bug! We've classified it as
   
   a bug in our system.
   
   We encourage you to continue the discussion and to find an acceptable workaround while we work on a permanent fix.

   
   


2. 
   
   
   

   
   

   
   

   Moving items from one tree panel to another is very slow

   
   

   
   

   Moving items from one tree panel to another is very slow

   
   
   
   

   
   

   See following fiddle: https://fiddle.sencha.com/#fiddle/bnf
   

   Whatever the way to do it, moving items from one tree panel to another is very slow. On my machine, with IE 11, moving 100 items from one panel to the other takes 25 seconds. On the other browsers, it takes much less time, but it is still too long.

   
   

   Should this be considered as a bug?

   
   

   
   

   
   

   
   

   
   

   
   
   
   

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[OPEN] Moving items from one tree panel to another is very slow