Default Wifi problems, connects but very lousy Internet

This happens at work and home on separate routers. One is a Cisco running DDWRT firmware, the other is a Cisco small business firewall router. They are both wireless N 2.4ghz and run on fairly open channels.

I've tried fooling with the channels, the encryption type, etc. What happens is my apps or Web pages fail to load. If I turn off wifi, they work just fine.

I have multiple tablets working just fine at home and hardwired computers that never lose Internet so it should not be an issue with the gateway.

Any other ideas for fixing this? I had a Galaxy S4 which had issues with AES encryption but I tried TKIP and same problem here.
My Smartphone history with AT&T:
January 2005: Audiovox SMT5600 aka HTC Typhoon
June 2006: Cingular 8125 aka HTC Wizard
October 2007: AT&T Tilt aka HTC Kaiser
June 2009: AT&T Fuze aka HTC Raphael
November 2009: iPhone 3GS
July 2010: iPhone 4
October 2011: iPhone 4S
July 2012: Samsung Galaxy Nexus GSM/HSDPA+
May 2013: Samsung Galaxy S4 4G/LTE
April 2014: Samsung Galaxy S5 4G/LTE