+ 0 Votes Partial answer Rick_R 4 years ago Well, after a LOT of searching I have found SOME improvements. I removed Nvidia's drivers and the following still make massive improvements.1) Install MPlayer.2) Right-click on the MPlayer SCREEN, select Preferences.3) Turn on the cache. The default size is 2048. I don't know what that represents (Kb, Mb, etc.) Increase it to something like 65536.4) Adjust the audio quality. (The theory is that the CPU may spend less time on audio.)Save the changes, restart MPlayer.I found an old post about "black screen" problems with MPlayer. It says (around Ubuntu 6.04) that sometimes there are problems with Xv, so in MPlayer Preferences, Video tab, make sure X11 does not include XV in the driver.I also found a post saying there was a bug in an AUDIO driver that can slow down the VIDEO.1) System => Preferences => Multimedia Systems Selector2) Change the Audio output from Autodetect to OSS.Chances are just increasing the cache will probably fix most problems, but if not, try some of the others also. + 0 Votes MPlayer cache is in kilobytes Rick_R 4 years ago The cache size in MPlayer is in kilobytes, so you probably want to use a setting like 8192 (8MB) rather than 65536. + 0 Votes I had to remove the Nvidia driver Rick_R 4 years ago I reinstalled Nvidia's Linux driver to use Compiz and the videos stopped working. I removed it again and they're working again. Movie Player also works now. The driver is from February 2010. I turned off the fancy effects in Windows 7 because I found them annoying, so it's not that I need them in Linux. YouTube videos still run slow and choppy, but my DSL is fairly slow and I can download and save the ones I need. I'm still trying to find out how to increase cache size in other players since that seems to be what works best.