It's been a week where Microsoft's PR efforts in promoting Natal to the mainstream press and celebs alike have been met with mixed fortunes. While Peter Molyneux soldiers on with good work evangelising the tech to both consumer and specialist press alike, puzzlingly the hands-on demos continue to run on the aged E3 2009 platform. Nobody outside selected, NDA-respecting developers knows the quality of the production version.

However, the potential is obvious: no less a man than Jonathan Ross describes it as "impressive... sky's the limit" but at the same time cautions that it's "not quite there yet", while his son went so far as put a disclaimer about the lag on his YouTube video showing Dad in "action". Hey, Natal news is so thin on the ground that we'll take it where we get it.

The truth is that Xbox 360 games in general and Natal in particular have been fairly easy to measure for so-called controller lag: the time taken between human movement and the action occurring on-screen. We've got a Ben Heck controller board for measuring 360 response while the video demo of Natal in our hands-on at gamescom last year speaks for itself and was the first real effort to measure its responsiveness.

So, can PlayStation 3 and its so-called "Arc" motion controller offering be put to the test in any kind of meaningful way? So far, the project has been even more carefully guarded than Natal. Less than two weeks from now, GDC kicks off and with it the first opportunity to get a good look at the wand and hopefully go hands-on with the motion controller. I expect it to be very good: after all, most of the component technologies that comprise the system are out there now for anybody to try.

The wand itself hooks up to the PlayStation via Bluetooth - just like your SixAxis or DualShock 3 - while motion-tracking of the wand itself is achieved using the PlayStation Eye, another piece of tech freely available to anyone. I picked up mine from the online SonyStyle store over Christmas for £15.

follow the link for the rest of the article http://www.eurogamer.net/articles/digitalfoundry-vs-console-lag-round-two-article

Look like sony wand have more lag then natal

Arc won't be put to the test until GDC, this is more about lag in general, and a bit of a prelude for Arc.

They didn't use arc for this, just the eyetoy.

"Analogues for those figures can be found by measuring actual gameplay and we go to GDC expectant that Arc will work well as a direct joypad replacement. There's zero reason whatsoever to expect that button presses will be any less responsive than the trusty Dual Shock 3, and while movement might feel a touch less responsive, wand motion should carry far more information in terms of movement/trajectory. To put it basically, pointing is more accurate, precise and natural. As a parallel, the Wiimote has more lag than the PS3 pad, but there's no doubt that you can point and shoot at opponents far more quickly in the Wii rendition of Call of Duty 4, for example."

That last part is comparing the dualshock to the wiimote by the way, not wiimote to arc

What Rainbird said.

Also, it says lag for the "eyetoy" is between 100 ms and 133 ms, very similar to Natal.

Nice try though.

Thats right, and I also wanna add that by my understanding of the E3 tech demo, the eyetoy and ball is only for 1:1 depth perception, the accelerometers and gyrometers takes care of the other things. I read the complete article, and it seems they are implying that the eyetoy will do all tracking.