If anyone is fed up of watching ads, lag, buffering, all of the Twitch clutter especially with the default Twitch, i strongly recommend that you give Alternative Player for Twitch a try, been using it for a month now and will never go back, here are links depending what browser you use.
Chrome https://chrome.google.com/webstore/detail/alternate-player-for-twit/bhplkbgoehhhddaoolmakpocnenplmhf?hl=en
Firefox https://addons.mozilla.org/en-GB/firefox/addon/twitch_5/
Edge https://www.microsoft.com/en-gb/p/alternate-player-for-twitchtv/9p9p2nd0s56c?activetab=pivot:overviewtab