Just to preface all of this, this problem is only affecting one computer on my network, and the problem has only started yesterday.
My advertised speeds are 40mbitup/down, and I've been getting that until I installed a program called cFosSpeed to tweak some ping settings. After installing this program, my upload speed drastically fell (anywhere from 0.50mbit to 7mbit). My download remains stable at 40mbit/s.
I uninstalled the program immediately, rebooted, and was still greeted with the same slow speeds.
I ran TCP Optimizer, applied Optimal settings, rebooted, and got no better results.
I even tried uninstalling my anti-virus to see if that would fix it; no go.
My on-board network card is Atheros AR8151 PCI-E Gigabit Ethernet Controller (NDIS 6.20), if that helps.
Here are my Analyzer results:
« SpeedGuide.net TCP Analyzer Results »
Tested on: 2012.04.24 12:52
IP address: 108.29.xxx.xx
Client OS/browser: Windows 7 (Firefox 11.0)
TCP options string: 020405b40103030201010402
TCP Window: 65700 (multiple of MSS)
RWIN Scaling: 2 bits (2^2=4)
Unscaled RWIN : 16425
Recommended RWINs: 64240, 128480, 256960, 513920, 1027840
BDP limit (200ms): 2628kbps (329KBytes/s)
BDP limit (500ms): 1051kbps (131KBytes/s)
MTU Discovery: ON
IP ToS: 00000000 (0)
Any help with this would be greatly appreciated, as I'm not sure how to remedy this at all.