I have an issue with my internet connection where some web sites (including google.com) are sometimes really slow.
My internet connection is optic-fiber, very stable, ping to 220.127.116.11 without any error all-day long:
When I access the internet from my Windows machine, all web pages load very stable and fast.
When I access the internet from my Mac (same WiFi), some web pages are very slow some of the time. This happens both in Safari and Chrome, I always test both.
I was able to catch the last occurrence in Chrome console:
During the time I was recoding Chrome console above, YouTube was playing music non-stop, I was communicating with Messages and e-mail.
Any ideas where can I start debugging?