My ISP is Verizon and I am curious why the reported network speed is different at different speed test sites. One would think that with the "constant" speeds available by my PC's processor, browser, modem and router, the speed tests reported by various sites would be closer.
Speedtest site.............Download................Upload
Verizon........................101........................131
Comcasr........................120.......................120
SpeedGuide....................82........................75

Thank you for your response.
Tom