Why is it when in a well lit environment but there is a black surface, my cameras live view gets really slow and picture get all blurry?
My thinking as well. Your camera is getting confused and using a really slow shutter speed, which causes the apparent lag in live view.Some cameras in auto think a dark surface means it's dark outside and will have trouble focusing and/or use goofy camera settings.
If you can give more info we may be able to help.