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After years of marginal performance of DVBViewer Pro and other multimedia players on Atom-based netbooks, I recently bought an HP Envy 15 laptop containing an Intel i7 Quad-core 4th-generation (Haswell) processor and Intel 4600 graphics. The new laptop runs Windows 8.1 in 64-bit mode. It seems to have solved all of my former player performance problems except one: the rendering of DVB-S2 streams in DVBViewer is blocky/jerky. Rendering of standard definition video streams in DVBViewer seems normal. In fact, DVB-S2 performance of DVBViewer with the new laptop seems worse than it was with the old netbooks, which all had NVidia ION graphics adapters with CUDA features that were used by the (excellent) CoreAVC video decoder. Alas I read online that the CoreAVC decoder has not been updated to work with Windows 8 or 8.1. With both old netbooks and new laptop I am using a TechnoTrend S2-3650CI USB satellite tuner. A concrete example of blocky/jerky rendering is the unencrypted French/German "arte" HD channel that DVBViewer identifies as having a 62% (green) signal level with a 1920 x 1088 x 25fps video stream (as well as a 48KHz x 192 Kbps audio stream) with variable video bandwidth that seems to average around 7 Mbps and sometimes exceeds 10 Mbps for short bursts. Beyond the high speed of the i7 Quad-core processor itself, I read that Intel 4600 graphics includes a set of specialized hardware features that Intel calls Quick Sync. Quick Sync is apparently meant for H.264 transcoding, but it can be used just for H.264 decompression and rendering if that's all you want. I read that the current version of "ffdshow tryouts" DirectShow filter should interoperate well with Quick Sync. Alas, even with ffdshow and LAV Video Decoder installed, I can't find any settings of DVBViewer -> Settings -> Options... -> DirectX -> Renderer/Decoder -> Video -> Video A -> H.264 Video Decoder and/or ... Video Renderer or settings within ffdshow (e.g, QuickSync vs libavcodec) that reduce HD blockiness/jerkiness much. I also tried the PowerDVD 13 CLCvd.ax filter, as suggested in some forum postings. It didn't go blocky within individual frames, but instead skipped (perhaps half of the) frames to maintain sound sync. Attached is a support.zip file created today on the problematic new laptop. Can anyone suggest what might be going wrong? Many thanks, Ed McCreight support.zip