AT&T U-verse RG and separate D-Link wireless router -- good download speeds, but very slow upload rates

I have AT&T U-verse for my internet and television.  The built-in wireless on the U-verse gateway has been spotty at best, with download speeds fluctuating greatly between 12Mbps (which is the speed we are paying for) down to 1Mbps at times.  I'm getting these values from these speed test sites:  speedtest.net and speakeasy.net

At AT&T's recommendation, I purchased a separate wireless router and have disabled the wifi on the AT&T gateway.  I purchased the D-Link DIR-855 wireless router.  The download speeds I'm getting now are consistently good (around 11Mbps); however, my upload rates are crawling (around .5 or less Mbps, as compared to what we should be getting at 1.5Mbps).  I don't know why this is.  Could there be something that I have set incorrectly in the settings for either router that may be causing this issue?  How can I best troubleshoot this problem, so that I may correct it?

Thanks for any suggestions.
-s
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sah18Asked:
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Aaron TomoskyConnect With a Mentor SD-WAN SimplifiedCommented:
Turn off qos in your dlink.
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sah18Author Commented:
Thanks, aaron!  

I tried first disabling QOS engine in the dlink & rebooting.  Same upload speed results.

Then, I tried, along those same lines, disabling "WAN Traffic Shaping", rebooting, and that seemed to do the trick!

Any idea what the difference is between QOS engine & traffic shaping??
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Aaron TomoskySD-WAN SimplifiedCommented:
They are both methods of controlling traffic speed and flow. However when improperly setup they just slow you down. If you have consistent upload bandwidth like a t1, they can help certain traffic get priority and make your connection feel faster.
They are not bad things  by any means, feel free to mess around.
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sah18Author Commented:
Great, thanks again for all your help!
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