For every European who is suffering from stuttering on twitch streams in high quality I just found the solution. A small chromium plugin that tricks twitch into routing you on an US cdn. The only way to fix the europe specific cdn stuttering. Works like a charm for me, might do the same for you.

Authors Thread on TL
Plugin in the Chrome webstore

For everyone who has no cdn issues but wants smoother playback at lower hardware usage there is the crossplatform script livestreamer which lets you watch twitch and other streams in vlc, mlayer, mpv or any other player of your choice. Unfortunately I know of no way to combine livestreamer with the above mentioned cdn trickery. To combine livestreamer with the cdn trickery you have to build it from source and apply this patch.

Hope this might save someones DreamHack viewing experience. Have fun tomorrow, can't watch the show live because of my evil university schedule. :x