86a57b04bf
Set is much slower to iterate through (due to cache misses and such) and the only advantage of using set is faster removal of link. However, we are iterating links much much more often than removing them, and even when we are removing links we don't really need to remove link from nodes which it connects -- we don't support partial depsgraph updates, so removing links from nodes on destruction is a waste of time. If we ever want to support partial updates we can have dedicated function to remove link from nodes it connects. This gives a surprising increase of fps from 42 to 56 with test file from Mr. J.P.Bouza (blenrig_for_debugging.blend). Surprising because old DEG is actually slower here (52 fps). Didn't see any regressions (and don't see why they will happen), so let's ask our riggers and animators to perform further speed tests ;)