Hi Sumit,
We can reproduce the reported issue “performance issue while drag group of nodes” and confirmed that the issue is a defect. The patch for the fix will be available on March 6th, 2019.
This fix will also be included in our Volume 1 2019 release on March 2019.
Now, you can now track the status of your request, review the proposed resolution timeline, and contact us for any further inquiries through below link.
Regards,
Ramya T