T520 internet lag problem - webpage timeout

My T520 has an issue with the internet.  Whether docked, connected directly to the wire, or connected wirelessly every time i navigate to a webpage it takes about 10-sec for the page to load.  This happens in my office (~250 people here) or at home.  About 50% of the time the page will time out and I'll have to reload.  This is a huge problem when filling out an online form... which is several times a day.
All drivers are up to date.  My IT personnel have no clue what the issue might be.  I don't have any non-standard software on the machine because we're not allowed.  Basically, everyone else's machine is about the same and nobody else is having this problem.
Lenovo T520 Intel Core i5 @ 2.50Ghz, 4GB DDR3, 300GB 7200rpm
Intel HD Graphics 3000, ThinkPad 1366x768 + VA2033 1600x900, Intel 82579LM Gigabit + Intel Centrino Advanced-N 6205, Windows 7 Professional 64-bit with SP1

Well given that you also indicate a wired connection is giving you a problem.
The software versions used should be relatively current. If you are using one of the 1st Power Manager packages then I would update both the driver and manager package (two separate components). I am not using the very latest but previous version also worked fine.
Launch Power Manager and use the profile Maximum performance, then go into all the NIC's including WiFi in device manager as well as in the manager and turn OFF allow to shutdown to save power. A stupid option in this day and age. You want your ports working and available all the time include USB etc and everything live should be default but no the can get turned off.
Be also certain in power manager to customize you HD NOT to go to sleep EVER !! Always running.
Where is your DNS address coming from?
T520 Model 4239 Intel(R) Core(TM) i7-2860QM CPU @ 2.50GHz
Intel Sandy Bridge & Nvidia NVS 4200M graphics Intel N 6300 Wi-Fi adapter
Windows 7 Home Prem - 64bit w/8GB DDR3

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