 your modem, your router, whatever it is, and I would test the speed wired on your computer. Go to a website like fast.com or speedtest.net and see what your speed is. And also check out the latency and there's also some diagnostics on there that can give you an idea of if your signal is okay. Because you may have a wire or something that's frayed or chipmunk or something might have... Do we have chipmunks in California? Lancaster, I don't know.