Thank you so much!!!!!!  I saw two entries, one for a Smartbyte application, and a second for Smartbyte drivers and services.  Removing the application did nothing to help performance, but when I removed the drivers and services, my download went from about 25Mbps to about 160mbps!!!  Can't thank you enough!!

You're welcome, glad I could help!  This SmartByte "optimizer" has turned out to be the culprit in a few other threads reporting poor WiFi performance recently.  It appears to be a tool that's only offered bundled with certain Dell systems and is intended to give network bandwidth priority to "foreground" activity like browsing and Netflix, and throttle background tasks like Windows update downloads -- but obviously it's not always working as intended.  Anyhow, glad you're squared away!

I have a Dell Computer Inspiron 5748.

My wireless adaptor is slow.  I have gigabit wireless router download speed, newest on market.

Dell did nothing to fix, I got the Linksys AC1200 and it is giving me 150 speed but would rather get gigabit speed.  

I have no smartbyte application on my computer so what is my fix?  I like my temporary solution but would rather not have this attachment.

Get a USB wireless adaptor, EASY FIX. LINKSYS AC1200 which can get up to speeds of 867 Mbps

Wireless Adaptor is not working at optimal speed.  I have the new Gigabit Wireless Modem (fastest on the market) and I am getting 8mbps on a good day.  My cell phone is showing 500 mbps.  See the difference.

I went to a local repair shop, they checked my computer and said nothing is wrong with it except the wireless adaptor.  They suggested I get a USB version for $40 Canadian.  It works fast.  I bought the LINKSYS AC1200 which can get up to speeds of 867 Mbps  and I am getting about 150 Mbps and it depends on where I am as the speed varies but wow, from 8 Mbps to 150 Mbps is fabulous.   If am closer to Gigabit modem then the speed is even better.

I had to pay the local shop to ge the diagnostic done which Dell could have easily logged into my compter remotely and answered it in a few seconds SO I AM NOT IMPRESSED.

Thank You!!!

I have a Dell Inspiron 15 3000. I tried everything, searched Dell tried their solutions nothing worked. I found this thread about that SmartByte that they install to prioritize video. I did as you said, well first stopped and disabled it in services my speed increased by over 200x's Thanks for this thread. Funny how Dell forgot to mention that this was the issue.

I just did it and I do not believe this was the problem. Thanks.

I just uninstalled the SmartByte app from my Dell Inspiron computer and internet speeds jumped from 20MBPS to 107MBPS!

Worked like a charm on Dell Inspiron 15 5000 series I5558-2148BLK  went from mid 20's to over 100 mbps after the uninstall of  SmartByte app. Thank you!