Kendo grid optimization
Capitalisation:
If you're gonna use variables like this: kendoGrid, dataItem, but then have variables like: destinationgrid and sourcegrid, then stick with one (preferably the first, because it's easier to read)
Optimizing:
It seemed for me, that removing this line increased the speed:

editable:   &quot;popup&quot;,

Because with your code it popups for each data cell being removed, which is fine, if that's what you want
However, it seems with your code that it doesn't support the movement of more than one data cell at a time.
Note:
If you're wanting the user to select more than one nearly every time, then using popups is fine, but make it one popup per action.