Weird upload speed problem with only one computer others working fine.

After I was having this problem for 2 days with self-troubleshooting and fixing I decided to give up and ask the pro.

I am having a FTTH connection with speed 20/3 Mbps connecting to NEC ONU, then connect to Linksys E3000 router with DD-WRT Mega latest firmware.
From that point my it is connected to D-Link switch working at 10/100 and finally before reaching my PC.

The speed test I've got from is at 23/0.66 Mbps. The download speed is great but not the upload speed.

I decided to test the speed again via my laptop with the same setting as above (same connection method as PC) and the speed test results came up at 23/3 Mbps which is normal.

Then I decided to connect my PC directy to ONU and done the correct setting. The speed test result is normal (23/3 Mbps). However if I connect my PC directly to router it would give me a bad results.

I'm suspecting my router so I did a hard reset and re-done all configurations and there is no luck with the problem.

I did try to scan all virus via Symantec Endpoint Protection with latest update.
I did try to scan all malware or adsware via Spybot Search and Destroy with latest update as well cleaned up some items but it didn't solve the problem as well.

I'm using Windows 7 Ultimate Edition with all latest update.
My computer specs are :

Intel i7-3770
Gigabyte GA-Z77X-D3H
32 Gbs of RAM
Gigabyte GeForce GTX 660
Creative SoundBlaster ZxR
256 SSD
4 HDD drives.

I am not sure when the problem starts since I just install this new system several days ago and didn't touch it much. I found out the problem when I was uploading some photos on Facebook and Twitter, however the uploading was not success. I am guessing also that the upload connection is not stable enough.

Also I did check MTU settings and the settings was correct as well.

Any ideas how to solve this problem? I'm suspecting that this problem might be the problem from Windows. Not on hardware.

Thank you in advance. :)
2 answers Last reply Best Answer
More about weird upload speed problem computer working fine
  1. Best answer
    Try disabling the LAN Optimizer (Atheros - Intel 7 series). I had a similar problem with the drivers.
  2. ronintexas said:
    Try disabling the LAN Optimizer (Atheros - Intel 7 series). I had a similar problem with the drivers.

    I didn't install LAN Optimizer on my PC at all.

    Also updated a newest driver from Qualcomm Atheros website. Still not working.
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