No problem, here you go.
https://www.dropbox.com/s/gtvl8ve91h1oq4c/JazJon%27s%20DxDiag.txt
I uninstalled the Beta driver package and installed the latest
Intel HD graphics Driver for Windows 8 x64
File name: Win64_15319.exe
Version: 15.31.9.64.3165
Download Date: 05/10/2013
Status: Latest
Per your request, I just confirmed that "VLC Player" can Speed Watch MCE DVR *.wtv files smooth at 1x/1.5x/2x/etc on both my NVidia based laptop and my Intel HD4000 based HTPC. For some reason Windows 8 Media Center speed watching playback with HD Graphics chips are not smooth for myself or anyone else. Multiple people have confirmed this on TheGreenButton (Media Center) Forum. Again Windows 7 is smooth, so something is not optimized right on the intel Windows 8 HD drivers.
Please let me know if you've replicated the buffer/lag stutter. I provided the example above.
Speed watching is great for watching twice the amount of TV in half the time. It plays with my head when it's herky jerky. It's very smooth and natural looking & sounding when it's right.
Thanks for looking into this! I'd hate to have to avoid or not recommend Intel Graphics HTPC's to my friends in the future.
~Jon