Hello,
just by marking anything but view port engine is too slow and by hover or drop down anything same issue happens
the video explains my issue
pc spec
cpu : xeon e5 1660e
ram 32gb
gpu gtx 1080
update>
I tested same simple project on 4.11 and it is working fine no fps drop issue not even while building
the issue happens when iam using 4.12.5
thanks for the help!