I'm trying to troubleshoot a problem at my parents house with their internet speeds. If I hook the cable modem directly to the pc, they get 100Mbps down and 6 or 11 up (I can't remember honestly). If I introduce a router into the mix, their speeds drop to 30Mbps down and 6 up. This is using either wired or wifi from the router. They were running a very old wifi router (8 years ish) so I thought that could have been the problem. Yesterday, I set up a new Netgear Nighthawk ac2600 router at their house and the issue persists. It does not matter if I use the Wifi or run a cable from the router to the pc, the speeds drop more than half compared to a direct connection to the modem. However, all of our phones will connect to the router and get ~ 60 down on the 2.4ghz band and 100 down on the 5.0 ghz band. It is ONLY the pc that is acting weird. Any suggestions here? ***UPDATE*** 11/18/19 -Parents internet speeds have been tested with 3 routers, 3 cable modems (2 of which are exactly the same model; SurfBoard 6141) , 2 PC's, 2 Iphones. -Parents PC direct connected directly to any of the modems gets Full speed of 230/12 (except one of the sb6141's gives 120/6 because I assume it is broken in some way) -Internet speed when tested on parents pc drops to ~20/6 with ANY combination of modem and router, wired or wifi. -Internet speed when tested using my pc with any modem and router gets full speed, again except for that one sb6141 modem because its messed up. -Internet speed on Iphones get proper speeds depending on wifi band that is being used. Parents pc has newest bios, nic drivers, and windows updates. Current suggestion is to re-install windows. That may or may not happen, its up to my parents.