HP Pavilion Sleekbook 15-b119wm, Windows 7 Professional SP1 64-bit, Wired Juiced Systems 6+1+1 USB 3.0 Gigabit Ethernet Hub, Realtek USB GbE Family Controller, TRENDnet TEG-S81g 8-Port Gigabit GREENnet Switch, 1.6GHz AMD Quad-Core A8-4555M Accelerated Processor, 7.47 GB RAM Crucial 8GB (2X4GB) PC3-12800 1600MHZ DDR3 204PIN SODIMM 1.35v CL11 Unbuff, ASUS USB 2. Not sure you need it but here are my specs:

You may also have to install the driver yourself if you are building a new PC. Even though this device comes integrated on most devices, its driver may not be installed on your PC. The only thing I have done recently is I installed Kaspersky Total Security 2019 as my license for the 2018 version was set to expire. Realtek PCIe GBE Family Controller is a network interface device for wired LANs. I also checked under Network Connections>Local Area Network>Status>Speed is showing as 1.0 Gbps. POWER MANAGEMENT is disabled and so is ENERGY EFFICIENT. I made sure SPEED & DUPLEX are set to 1.0 Gbps FULL DUPLEX. The times I've had this problem before (6 months ago and longer) this would always work and my speeds would go back to normal so I can't figure out why it is not working now. This is also facilized with Intel USB 3.1 Gen1 USB Type-C andOptane. I've checked all the cables, updated the drivers, powered down the laptop, the router and the switch, disconnected the power cord from the socket, waited 15 mins, plugged them back in, retested and get the same results. This RGB fusion board has Intel GbE LAN withcFosSpeed internet accelerator software.

I've been getting speeds of 100-130 Mbps until last night all of a sudden my speed tests are ALL 50 Mbps and lower.

Realtek usb gbe family controller