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I've my PS3 (60GB-model) connected with Wi-fi to my network with ~12Mbps down and ~3.5Mbps. Though all games (GTA Online most recently) keep lagging and I don't think that should be a problem with that speed. I've tried with wired connection and that works much better though I have to use wireless. I've no problem with Wi-fi on other kinds of devices.

Using Pingtest I get 103ms on the PS3 and 36ms on my laptop.

Is there something I can try to fix this?

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    Speed is one thing, ping is another. Your up-/downstream merely tells you how much data you can push around in a given time, but the ping describes how long it takes for an answer after a request. WIFI is infamous for having a much worse ping than Ethernet. The farther you are from the antenna, the worse your ping will be.
    – Nolonar
    Commented Oct 30, 2013 at 21:06
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    Network latency is much more important than bandwidth. I have slow broadband, but a rather low latency, thus my gameplay is still smooth.
    – Raptor
    Commented Nov 5, 2013 at 2:30

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Wi-Fi is rather notorious for being susceptible to interference (they're just radio waves, after all). Here's a small checklist that you should go through to make sure you're doing everything you can to reduce interference:

  • Place your wi-fi router at an elevated place, away from sources of interference (such as TVs and soundsystems, as these have been known to cause interference).
  • Move other wireless devices (phones, tablets, etc.) away from the router
  • Play around a bit with the channels: though it should be set to "auto", a neighbour's wi-fi may be interfering with your own, causing delay and packet loss. If this doesn't help, you should put the channel setting back to "auto".

If nothing helps, you'll just have to somehow get a wired connection to the PS3. Your other devices probably don't need as little delay that the PS3 online games require to be played with no noticeable problems, hence why you're not experiencing any issues on them.

Quick edit: A difference of 103ms vs 36ms using the same router is pretty big. I don't know if consoles are known to have slightly worse network capabilities, but it also seems like there's some interference, or it might just be that the PS3 is too far away from the router.

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