My problem is very simple. I have two computers, a macbook pro and a prebuilt pc. While connected to ethernet, my macbook gets around 600-700 upload. While this same ethernet is connected to my PC, my upload speed is 100-200. my network adapter is capable of a gig up and down, with the specific model being Realtek PCIe 2.5GbE Family Controller. The drivers are up to date with their website. What could possibly be causing this issue?