I only hit like 1.5% rendering windowscentral.com, and then it quickly drops down to 0.2-0.6% on my i7. Does it sit at 20% for you, or does it die off after the site is done rendering? And are you sure you're looking at the CPU usage specifically for Edge and not the overall CPU usage for the whole system? Because running Edge and nothing else, my overall usage sits right around 20%. That's not because of Edge, just because of the OS and all its background processes.