Go to X-Term and do before test killall gst-video-thumbnailerd kill `ps | grep mafw-gst-renderer | grep -v grep | cut -f2 -d' '` (space between two quotes). The sluggish video may be because of bugs 8165 (https://bugs.maemo.org/show_bug.cgi?id=8165) or 7147 (https://bugs.maemo.org/show_bug.cgi?id=7147) If helps - vote for it for faster resolution. (this message is copy from http://talk.maemo.org/showpost.php?p=531241&postcount=5)