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Still struggling with slow wifi network performance

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I am still trying to get to the bottom of very 'laggy' wifi network performance. I am still not really sure if this is a wifi problem (new TPLink WDR3600), or an Internet problem (VF/TV cable Warpspeed!)Clues are:1. Using a new Samsung laptop and the new router and TC/VF's fastest connection, I regularly wait for seconds while browsing webpages while absolutely nothing happens. (e.g. Stuff.co.nz regularly stops responding due to a slow-running script; Speedtest form time to time chooses 'closer' servers than Snap Chch, such as New Plymouth!)2. Speedtest results are all over the place. Sometimes ok at about 10/1 or even 10/10! (go figure), but often significant delays when again simply nothing happens, or overall rates down to under 0.1Mbps.3. Wifi 'connection speed' varies between 108Mbps and 1.04. Now swithed router to channel 13 on 2.4Ghz but no improvement. Signal strengths reported only about -70-80 or -50-60 depending on device. Have one or two other neighbouring networks on chanel 1 (usualy, neigbouring primary school), and channel 9 (weaker and only intermittently visible). Certainly not as much contention as I find in most people's houses I visit!!5. Wired PC performance seems to be not so badly affected (Speedtest-wise) as usualy achieve nominal 100/10 speeds. I find it really hard to believe that this is just normally 'poor' wifi performance. The overall standard seems significantly worse than what I thought was my obsolete combination of a Linksys WRT54G and a Dell Latiatude with a 2200b/g wifi card.Anyone with any new suggestions about how I might be able to more clearly identify where or what the problem us.

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