This is going to sound random, but I reinstalled the operating system using the Dell Recovery Image. Fixed the problem for me...
Updating the driver, regardless of how I did it, made no difference.
Any updates on this post? i just got a new xps 14z. Increasing the roaming agressiveness as Terry proposed really helps. It is now just as good as my six year old laptop. Ofcourse I got the latest drivers from Dell. But anyone tell me whether it is better to have the Dell drivers or the drivers from Intell?
Hi. I just got a new laptop yesterday, 4/20. It had the same slow internet speed problem. I have done the driver re-do's. I have been on the phone for about 2 hours with Dell tech support while they had control of the Dell 14z XPS trying to figure out why it had a speed of 24 to 33 in safe mode and 4 to 8 in regular. Can you help? I think I should just send it back. I've already done a clean install of Windows 7 with the disk, redone the internet drivers as you suggested, the tech verified that I had the latest drivers. Even he was stymied. He said he was calling it a 'class C' problem and would have to get back to me. Honestly, I don't have the patience to deal with a problem like this with a brand new machine out of the box. Thanks for any help you can give me.
Just out of curiosity, what type of modem and router do you have or are you using a combo gateway?
The reason I ask is because the issue may in fact not be with your laptop but within your network. As a test I would suggest you take your laptop to somewhere that has a different network to try.
The drivers directly from Intel corrected my problem immediately and it works on all networks. I am typing on it right now and it is very fast. I've made no other adjustments except I ditched McAfee A/V which ALWAYS caused my system to pause. You may want to try that if it is installed.
I did ditch McAfee. The router is Linksys. It shouldn't matter though, since, in safe mode, the speed is pretty good - 29 to 33 the last few tests, compared to about 4 to 7 out of safe mode, so it's something that's 'on' or 'running' out of safe mode. Aack!
Rather than trying another router, try your laptop on another network. As you already know these adapters are finicky and don't respond to all router/modem or gateway set ups the same. Until you get laptop dialed in, it's important to ensure that it isn't the modem/router running block. In thinking back I did re-boot my modem & router after I updated the drivers.