Excellent DL speed but high latency on O2

[ventmore]

Using testmyiphone.com, my DL speed consistently hits 1.3Mbps, and I've seen it go as high as 1.9, but the latency seems really high at 700-800ms.

Using http://i.dslr.net/tinyspeedtest.html to check my latency, I get figures of around 300-400ms, with at least one really high figure nearly every time......sometimes as high as 6000ms.

Is this just the nature of mobile broadband?

Cheers
Neil

[ventmore]

Could someone (preferably on o2) please try the 3G test at http://i.dslr.net/tinyspeedtest.html and report back......after 15 or so runs, I'm getting latency as high as 8000ms which seems absolutely ridiculous.

On a sidenote, I tried my iPhone sim in my windows mobile phone (on the suggestion of o2) which gives slightly more network info in that it shows a different icon for 3G and HSDPA. It seems that I'm flicking regularly between 3G and HSDPA......could this be the cause of the latency issue?

[ventmore]

It seems that the high latency almost always only happens on the first, and maybe second ping after the connection is idle...after that, I get 300-350ms.

Basically...if I browse to the page and run the test immediately, it seems to work quite well, but if I browse to the page then leave it a while before running the test, I get the high latency problem on the initial pings. Similarly, if I browse to the page, then press the home button, the reopen safari and run the test, I get high latency initially...sometimes as high as 11000ms for the first ping. I get the same result using GPRS, 3G, and Wifi, so I wonder if the connection goes into some sort of power saving mode, and that's why th initial connection takes longer.

I did go into the local CPW today to try their demo models, and they seemed to work a little better, but they're running FW 2.0.0, and I'm on 2.0.1, so it's not really a fair test.