Compared to Unity it is still slow, but both have their pros and cons.

Thats simple, i tested at work on a good PC , but with no
3D gameing card, but that can do some 3D !

I tested two things :
- A8 engine with the last RPG template from AUM98.
- Then i tested DX Studio with a simple scene (one 3D barrier,
one light, one little piece of terrain mesh) and made an exe !

DX studio program was running so slow like only some 2 or 6 Frames / second) ; too much slow.
But A8 RPG template was running greatly and incredibly smooth.

For me that sort of little test really show what engine of the two have good 3D optimisations (somethings perhaps you won't see directly on a big big last powerfull PC) !

So yes, DX Studio even in the last version is too much slow, i think it's simple , Javascript is interpreted language also, and that's also one point that really slows it down !

For me it remains a little toy , or a little engine for 3D artists to play with but it's not for
making games using a good amount of effects and polygons as some of 3DGS indeed.
The only advantage i found was all the workflow and it's intuitive world editor and objects properties access !

Well just my test and my taste

JavaScript is probably not the problem, it can be pre-compiled. The renderer and the optimizations to save draw calls, textures and polygons will probably cause more problems.

yes, interpreted languages don't have to be that slow anymore.

i think dxstudio uses the firefox javascript engine and if it uses a rather recent version then it should feature a jit compiler.

Same here
It was so slow that I thought to have made something wrong
I am not a fps fanboy, I dont care if an engine run at 50 fps rather than 60fps but 5-6 fps is not acceptable of course
By the way I still refer to 2.0 version, I was so disappointed that I quitted wiyh DXSTUDIO even if I like its workflow
Did you test version 3.2 ?

Same as Ventilator and Frank, it is definitely not because of JavaScript
It does not even depend on the lack of portals ( It must have zones, I suppose) since I tested some animations on a blank screen

In fact i have tested the version on their download page ,
so i premuse it was 3.2 !

I like their advertising title
"The most powerfull 3D Toolkit on the world ?"
It's a question in fact caus they say after that : We'll let you decide that !

It's pure teasing , caus when you test i think lot of people knowing others 3D engines have been really disappointed it's so so slow !

Good news:

Perpetual updates are back!

Zbrush like ; i like that a lot.
But this engine is the hell to program in C++ , just take a look at animation on the WIKI !
I talked about it in other engine in C++ that was lot lot more easy to program (something like simple functions to call , somwhat like the functions you call in C Script);
And they said indeed that C4 was really complicatde with too much predifined things and rules to follow.

But if you have a skilled programmer on your team it can be a big deal

Interesting :

Most likely, the iOS version will be available by Q2 2012, but it could be much earlier. (A lot of work has already been finished.) The Android version would either be released at the same time or follow within a quarter.

Let's wait to see if it will be complicated C++ or not ?
And will it contain all helpers (virtual pad, touch functions etc ...) we can find in some others 3D engines for mobile ?

I bought the C4 engine one year ago. And I don't like it. The world editor is nice and the features are kicking some other engines away, but the tutorials and wikipages are mostly outdated. Instead of releasing more and more features, the c4 creator should focus on documentation and renewing the tutorials. And realy, the demos are helping no one if you want to do other things than see spheres jump up and down. So the c++ code is realy clean, but if you have to write pages of code only to init the engine and than additional pages to let some balls jump up and down, than this effort is not worth the result.
Neoaxis engine is nice. But not everyones taste. It is based on the ogre engine. I like how it handles light. I never red how it does things. But I had a scene with at least 30 dynamic lights in it. And the engine didn't slow down at all. THe editor is crap.

but if you have to write pages of code only to init the engine and than additional pages to let some balls jump up and down, than this effort is not worth the result.

I agree a lot with that, even managing animations is too much like on the WIKI.
There are engiens having more highter level programming, all stuff being alreday optimised and coded C++ internally.
Even Ogre 3D that is C++ alos seems incredibly lot more easy :

// Set idle animation
mAnimationState = mEntity->getAnimationState("Idle");
mAnimationState->setLoop(true);
mAnimationState->setEnabled(true);

//Update animation function
mAnimationState->addTime(evt.timeSinceLastFrame);

It's only 4 lines, some others engine propose one line with a call to a function with paramters !
It's lot lot more easy than C4 and it's framework and all precoded stuff.

Just my personnal taste also !