My old computer (2.66 Ghz single core) used to cry when playing HD videos. So, figuring that I could get another year or two out of my old PC, I downloaded a cracked version of CoreAVC.

Huge difference. Finally the videos could play without stuttering, and run well on my machine. Except for gg's videos. Always during the OP when they have two separate lines of karaoke, it would still slow to a crawl and fall out of sync. Part of it was gg's inefficient encoding, the absurd filesizes they have grown into, and my computer just getting old. So I payed for the upgrade to CoreAVC 1.7, and they eventually upgrade to 1.8.

1.7 made it much more tolerable. The OP sequences would only be half a second out of sync, and the ED's strangely always worked now. I would never had to track into the main part of the video to resync under any circumstances. Other HD broadcasts played smoothly too. With 1.8, the issue was completely gone.

CoreAVC make the playback so much more efficient. I found it to be well worth the price on my ageing machine. Now I have a Quad core, but I still had two downloads of it anyway.