@fabio: thanks for removing your post.
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@ anthonie
OK. I'll try winding the CPU up a bit. You say 900 can play full 360p on mplayer? I find KMplayer generally better than cli mplayer but suspect I'm not giving it the correct settings.
I would prefer to use stock media player because it's h/w accelerated so cpu wouldn't need to run so fast and battery would last a bit longer.

@ vi_
Made a mistake on the initial pastebin - think I must have been running post-crash so settings didn't load.
http://pastebin.com/4LwMWzuF

Set it to default - rebooting now so brb