Safari slow and bad FaceTime quality

I recently got a new MacBook Pro (late 2016) and I have to say that I am very unhappy with it.

I am expecting multiples issues, but the most annoying one, is that after a couple of days using the Macbook without re-booting it and connecting it to my external display at work and at home, Safari (but also other internet browser) becomes really slow. It takes a long time for websites to open even though my internet connection is perfect (performed sped test). The other issue is that the FaceTime quality becomes really bad as well. There's a lot of disruption while the connection is great using my iPhone at the same time. All of these problems resolve immediately the I re-boot the Macbook.

It's very annoying because that means that I have to close all of my programs and restart everything just because I want websites to open faster or use FaceTime. I don't think this should be the case using a 3000 Dollar device!