Would it be a good fit for unity? Perhaps a tickbox to switch?
http://physxinfo.com/news/11297/the-evolution-of-physx-sdk-performance-wise/#more-11297
AFAIK unity uses 2.x and 3.x has almost double the speed for some tasks 
It’s interesting that Bullet physics are slower than Physx across the board, but 3.x physx owns 2.x with ease. I guess there might be licensing implications?
Didn’t Unity port PhysX to all its platforms?, it might be time consuming to do it again. not that that is an excuse.
yeah unity should upgrade physics. we can have things like force-fields and rubber frogs that was 4+ years ago.
That would be great, it looks like PhysX 3.3 uses less memory and runs faster, the only issue would be how well it scales down to lower spec platforms?
What version do we have now?
the slow version apparently 
Dear Unity, Faster physics please.
pleaasssseeee!
I particularly want to see faster physics optimized for 2D situations. Unity had a ninja camp thing about it and there is a bullet2d thing on the asset store.
Unity’s physics are definately outdated. Time to upgrade UT!
Hopefully we’ll get something new in 4.x
Faster physics couldn’t hurt. I agree that Unity should get on that.
Why don’t we have fluid simulations, force fields, or vehicle dynamics since they are nothing new to Physx? Surely they have updated beyond 2.8?..It’s over 5 years old.
Now faster physics. That’s a reason for everyone to hop to 4.x. And upgraded mono a reason to hop to 5.x
Sometimes you don’t need new features, you need to give people RAW SPEED. When you give people raw speed, you give them the features they’re really asking for 
Nah, Unity has too many other important features to work on…
you know… like mechanim.
Updated physics is much higher up my wish list than Mechanim. We all have different priorities. And it isn’t like UT can only work on one thing at a time.
I guess my sarcasm was underwhelming
Cmon man MoonJump, what about when Mechanim 2.0 comes out, that will be a great reason to upgrade to Unity 5. I’ll be the first to buy a license.
+1. Unity its about time!
Chipmunk2D is coming http://www.kickstarter.com/projects/howlingmoonsoftware/chipmunk2d-for-unity
Jump to 1:40 in the video to see a speed comparison with PhysX.
Faster PhysX would be my #1 request. I didn’t see an “idea” in the Unity feedback section for this, so I created one:
http://feedback.unity3d.com/unity/all-categories/1/hot/active/update-to-lastest-version-of-phy
Please give it some votes if you want this!
+1
Chipmunk 2D looks to be about 5 times faster than PhysX. … however that’s still not a lot of objects on-screen, it’d be great to see like 10 times the volume at smooth framerates. Isn’t it about time the physics ran on the GPU?