BUG: Poor Perspective Performance issues with SubD + Clipping Plane

[encephalon]

to be fair, i have noticed that the subdivided display actually is causing some additional lag, that very well could add up to some serious lag depending on the use case and equipment.

i have stated some concerns here

SubD performance

i have a scene with a ton of files and everything runs smooth, but ever since i have created 3 wirery table stands with maybe 20 curves the viewport performance changed drastically. i did not notice at first since i am used to have laggy performance working with bigger scenes. but these 3 subd’s are really very insignificantly small produced with multipipe. right now i was trying to get behind what is dragging it down and as soon as i hid them the performance normalised. i copied the objects in…