My Mac crashes Wireless Network every time

I work remotely most of the time, but when coming to the office the wireless network would crash every time. I thought it was bad router, but my co-workers started to notice it happens only when I connect. The network would slow down to a craw and crash.

I was eventually BANNED FROM NETWORK! :) 

I though I had some apps like Dropbox hugging the network, but it did not seem like it.

I have read that connecting to external DNS, not your Internet Provider's DNS, servers might speed up the lookup.

I got this list from support.hidemyass.com

• OpenDNS: 208.67.222.222 + 208.67.220.220    
• GoogleDNS: 8.8.4.4 + 8.8.8.8
• ComodoDNS: 156.154.70.22 + 156.154.71.22    
• UltraDNS: 156.154.70.1 + 156.154.71.1    
• NortonDNS: 198.153.192.1 + 198.153.194.1

To do so I got to:

Apple > System Preferences.. > Network > Wi-Fi (Connected) > Advanced .. > DNS

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