Ipad Touchscreen Lag/Latency

Discussion in 'iPad General Discussions' started by shaftpolls, May 9, 2012.

  1. shaftpolls

    shaftpolls
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    Hi Guys,

    I have one question for you :

    I just bought a new Ipad 3 and I'm concerned about the fact that I don't find any drawing/sketching app that does not "lag" or have latency problems. I don't know about you, but I feel very disapointed since I feel like I touch the screen and the draw is not instantaneously, it is fast, however its not real time, if this make sense to you.

    I'm comparing with the new/latest Android Phones, since I also tried and it works very well.

    Do you know if this is related to the drawing software itself ? Or a limitation of the touch screen response ?

    Thank you

    Cheers
     
  2. AQ_OC

    AQ_OC
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    It could be. You didn't name off any apps. The iPad as over 3 million pixels to deal with, so if the software isn't optimized you can have a lag. An app like Sketch Club lets you pic the resolution of the image...and you can see thta the highest one, for the retina screen, takes longer than the 1024 x 768 image. I can't say for sure which is creating the lag, though, the app or just the sheer number of pixels. I suspect the later but I would not bet too much money on it.
     
  3. shaftpolls

    shaftpolls
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    Well I have been watching several drawing apps on youtube, others I installed (free versions).

    I believe this is not directly related with Ipad 3, because the same happens with ipad 2.

    Its not a big lag, its a small latency that you notice everytime you touch the screen, this can be seen easily if you do fast moves with your hand or stylus pen.

    My only doubt about this is : Is this behaviour due to Ipad touchscreen hardware response, or related to the drawing software concept.

    Unfortunately I think that this is related to Hardware, since Microsoft is researching new screens with greater responsiveness.

    What do you think ?
     
  4. AQ_OC

    AQ_OC
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    As I saw it work get in one app at least, I don't think it is anything to do with the responsiveness of the touch screen. Yeah, MS needs to be looking at screens because they are so far behind in anything to do with a touchscreen.
     
  5. elija.wattson

    elija.wattson
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    Sure, it’s totally usable, but it never really feels like you’re fully in control. If you drag an app across the iPad’s screen, for example, the icon will dance around your finger a bit as the display tries its best to keep up. That’s not good enough for Dietz and his team, as they have whipped up a demo of how things ought to be — unlike the 100ms delay of a regular touchscreen, the demo knocks that delay between touch and tracking down to 1ms flat.The difference is staggering, especially when Dietz trots out the slow-motion footage. With the delay between touch input and screen response slashed by orders of magnitude, a device that sports the sort of super-low-latency Dietz envisions has the potential to feel far more (for lack of a better term) natural than its brethren. There’s zero delay when you slide a checker across a board, for example, and bringing that sort of instantaneous feedback to the many screens in our lives could help to bridge the gap between operating a bit of software and the feeling of interacting with objects.
     
  6. elija.wattson

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    While you might think there is no lag at all with your latest touch device, if you pay close attention, you can perceive touchscreen latency when you are simply launching an app. Try using a painting app and you might notice that the line you’re drawing always seems to be following your finger instead of flowing from it.
     
  7. followthesapper

    followthesapper
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    Question. Who is Dietz? :). I would like to see this demo if it is on YouTube.
     
  8. shaftpolls

    shaftpolls
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    Thats exactly my point. So I can assume that this is a Hardware limitation. It's a pity, however the next years will bring us surelly a new paradigm in that area. For me its very important the touchscreen latency, it's a underated feature that makes all the diference when interacting with devices like this.

    I found that Microsoft video, and here everyone can notice what am I talking about...

     
    #8 shaftpolls, May 10, 2012
    Last edited by a moderator: Jun 23, 2014
  9. MattIM

    MattIM
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    Thank you for your link. Now I understand. In the newly released Avengers movie, Tony Stark accesses computer systems with a tablet device and he explodes the monitor into the air and reaches for different virtual objects and examines the image in 3D. Later, when he and Dr. Banner are researching for a solution to counteract Loki, they use these huge see through tablet like devices manipulating data and instantly seeing the result on the object also viewed on the same device.

    I can see where your concern moves our technology towards movie reality.
     
  10. shaftpolls

    shaftpolls
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    Well, I feel frustrated since some new mobile devices like Sony Ericsson Xperia Arc S work with a very low latency..

    Even my old Xperia X8 seems to work faster than the Ipad on that particular feature. Maybe that's due to the size of the screen, I don't know.

    What I do know is that once you get used to lower latency response, you will never look back.
     

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