Slow Download Speeds, One PC, One ISP, Every Other Day

SnakeSpawn

Reputable
Jan 18, 2016
2
0
4,510
Hi, I am currently switching between ISPs.
Old_ISP: 15Mbps down
New_ISP: 50Mbps down

Old_ISP hasn't been giving me any issues.
New_ISP causes issues every other day, but only on one PC.

Every other day, my Desktop PC gets ~6Mbps instead of ~58Mbps (using Speedtest.net). Alternate days it gets the normal 58. Upload speed is consistent (5-6Mbps) regardless of day. This is testing with both a wired and wireless connection. The only changes lately are me rebooting things, which doesn't seem to have an immediate effect).

My Laptop PC gets a consistent ~50Mbps both wired and wireless (using the same wired connections). Cell Phone gets a consistent ~50.

If I switch back to my old ISP (different modem but same router), I get the expected ~22Mbps every time on all 3 devices.

Desktop:
OS: Windows 10
Wireless Adapter: Qualcomm Atheros AR938x Wireless Network Adapter (a/b/g/n)
- Driver: 3.0.2.182 March 12, 2015
- Connection Status: Speed: 300.0 Mbps
Ethernet Port: Realtek PCIe GBE Family Controller
- Driver: 9.1.402.2015 April 2, 2015
- Connection Status: Speed 100.0 Mbps

Router: TP-Link TL-WR841ND V9 (N Router)
- Firmware: TL-WR841N_V9_150310 October 3, 2015
Modem: Motorola SURFboard 400 Series SB6141
- (Purchased last week, default settings & firmware)

Troubleshooting Items:
As far as I can tell, there isn't an active application running that throttles my speed (at least nothing apparent in Task Manager).

Bitdefender doesn't detect any viruses.

I have Power Management turned off for both network adapters.

I tried testing without Antivirus and Firewall, no difference.

I reset my network configuration, no difference.
netsh winsock reset catalog
netsh int ipv4 reset reset.log
netsh int ipv6 reset reset.log

 
Ended up seeing the low speeds Monday, Thursday (evenings only), and Saturday. Turns out it was just that particular Speedtest.net host. Switching to a different location returned acceptable results. Also, verified using other Speed Test sites.