It could be a Hardware Issue
Videos, especially HD videos can be pesky if your PC is a bit older. These tend to demand more out of the video card than the card is ready to provide. If you’re sporting an older card, don’t expect to be able to run much. 720p? Maybe if you have a good processor. 1080p? It’s time for an upgrade.
If you’re running anything below a GeForce 8000 series card, it has never been more affordable to upgrade, and the reasons couldn’t be any better. Aside from increased performance in video, you can also get into PC gaming, which may be down on its luck but still has plenty to give in the form of Left 4 Dead 2, Crysis 2, and several other new properties coming to the PC.
But then again, it might not be the video card, it might be the RAM. Lack of RAM can cause videos to stutter and crash. If you’re running a 1 Gb setup, it’s time to upgrade for sure. Most modern Operating Systems and programs require at the very least 2 Gb of RAM. However, since RAM is so cheap these days, just go for broke and install 4 Gb to clear your conscience.
If it’s neither the RAM nor the video card, it could be the processor. An underwhelming processor can be a fatal cause of video slowdown. Today, a dual-core setup is integral to great High-def quality video. The lower GHz processors can’t seem to handle the intricacies of playing an MKV file or a Blu-ray disc without stuttering.