I pre-convert my video files to .mov with http://youtubedownload.altervista.org/ before putting in the sansa converter. It speeds it up alot. It sux to have convert a file twice but I find its better than waiting for ever the SMC. Most of my vids are only 30 min long so I dont know about longer files. I dont notice any audio lag either. Plus its the best youtube grabber i’ve used.