Optimize that LR5 and stop focusing on new goodies.. Still has no GPu acceleration and still need a freakin BEAST of an Overclocked cpu to be able to work decently in there without stupid lag when only navigating from one image to another in develop module.
Well, you are making an error assuming that feature development and core development are mutually exclusive. They are not, bit leaving that aside, you probably want to explain your pain-points more clearly.
I used very modest equipment, and Lr has always run reasonably well. There are always exceptions, of course, and consumer equipment differs widely. But there is no root cause for all perceived performance problems.
For example, GPU performance only affects a small part of the things Lr does, and most things are disc or memory bound, not CPU bound.
But, we can't know what your problem is until you describe it. Then we can work from the know to the unknown to work it out.
Maybe there us a problem. It is impossible to tell from this post specifically, and even the set of reports in an online forum are not good data points.