The short answer to that is that I don't know, because I've not tried the newest KPT client.
However I, and a couple of other guys here started some fixes in KPT for DWM which made Windows Mode faster than full-screen, if DWM remains enabled. (of course, that's not possible on XP) Sandurr already had a DirectX update implemented in uPT and rPT, (but he never openly documented much of what he had done) and Vormav is in the process of making a similar update.
Other private servers haven't usually gone to the effort of implementing out fixes, because it's not seen as a "feature" which would bring in more players. Players don't know that they want faster frame-rate, clearer fonts and correct aspect-ratio on a widescreen monitor. When you do market research, they say they want more maps, more monsters, more quests, more PvP. (all of which makes the game slower, harder to control and with a less stable server)
Our developments, now we are documenting them, are
very easy for Yedang to implement, because they have the original source code. They can even take what we have learned and apply newer techniques, which are very complex to implement without the source code into their client.
What they
have done, I don't know. There are
many things I know they could do, compared to 198x release clients they had. (which where horribly old, and used almost none of the accelerated graphics hardware introduced to PCs of the late 90s, never mind the past decade XD)
--- EDIT ---
Sorry for the delay, MentaLs backend update was in progress before my upload was complete.
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