My father (who works in IT) and myself are are stumped with a network speed issue afflicting some of our computers.
We have Time Warner, and they recently upgraded our internet speeds. First they upgraded from 20 mbps down/ 1mbps up to 50 mbps down, 5 up. Internet running fine (although I can't 100% say that, it was only a period of a few days before they upgraded again, I may have just not noticed it). They then upgraded to 200 mbps down, 20 up. This is when the problem started.
We have four computers between the two of us. Two macbook pros (one with bootcamp and windows 7), an Asus (windows 8.1), and a Lenovo (windows 7). All laptops. At certain times, and we have not been able to figure out a pattern, the Asus and Lenovo will have slow download speeds. By slow I mean anywhere from 4 mpbs- 8 mbps, depending on the location in relation to the router. They both are slow at the same time, and fast at the same time. The upload speed is always at full speed. When we are not having the slow period, they are running at full speed.
The macs both always run at full speed, including when I am testing it on bootcamp. So it is only the true PCs that are having the issue.
Our router is only capable of handling about 60 mbps, but that isn't a huge issue (unless it is related to our real issue). A wired connection will always produce full speed. We have an apple airport base station router. The cable modem is new. We also have another router that is an extension of our network in another room. It is on a separate channel, and when producing slow speeds, we are still connected to the base station (the primary router).
The wireless card drivers on my laptop (the Asus) are fully up to date, after checking the Asus website. It is highly unlikely that there are any viruses or malware on our computers. The Lenovo and Asus have different brands of pretty much every component, including wireless cards. We are thinking it might be a hardware issue in some capacity since the bootcamp verson of windows is running fine. All computers are relatively new, with the PCs being newer than the macs. (The Asus is months old).
We can't figure out where in the chain it is messing up, since multiple computers are afflicted at the same time, but not all, and the router has worked for a while, and an ethernet connection from the router works as well. The router is set to 802.11n (compatibility). we have tried setting it to other frequencies but no effect.
I may have found some success choosing the prefered bandwidth on my PC. When I set it to prefer 2.4 ghz, it seems to speed up, although that presents other problems.
Any insight would be GREATLY appreciated.