not sure, if someone else asked this before (thread is going bigger & bigger -> perfect), but I recognized the following "problem":
I use the files from wmchris's repo (so thankful !!!! Thanks!!! ), but couldn't get into the system (using 1.2.25 Bios). So I decided to use the OsxAptioFixDrv-64.efi from another repo (GitHub - corenel/XPS9550-OSX: This repository contains my own files ...) and it worked right away. Strange I patched my backlight (1080p model) for better stepping, anything else is as wmchris suggest it to be in his guide.
When I stream, especially from Eurosport or dailymotion, the system stuck every 4-6 sec, but audio still works perfectly, only video output is lagging (Mouse, too). Other streams work just great, couldn't figure out the reason. If I use Opera instead of Safari, there is no problem. I just want it to be solved having the "real Mac feeling" as good as possible and perhaps, anyone else experiences the same problem..
On my Hackintosh-Desktop, same OS (10.12.5), Safari can play it without any lag
Anyone an idea, what the cause could be?