Hi Pradeep,
I would say: keep looking the following IE11 performance related notes:
2163772 - IE Issue: Massive performance issues in IE11
2099080 - IE Issue: Performance issue IE11 quirks mode
2170160 - IE Issue: Massive performance issues after installing KB3038314
IE11 is supported, as long as you have the required software components described in the SAP Product Availability Matrix (PAM).
Kind regards,
Cris