Re: Using compressor instead of mpeg streamclip, takes 10 times as long. Settings issue?

You need to look at the "Inspector" window for what the settings actually are, rather than the preset.

In general, the things that slow Compressor down are having the "better" or "best" choices in the Resize Filter, Deinterlace and Rate Conversion sections in the Frame Controls and doing a two pass rather than one pass conversion. (Mpeg Streamclip also slows down if you choose multi-pass for your conversion - those things add to the amount of work the computer has to do). I think it's often worth doing a couple of tests with different settings and looking at the resulting files very carefully to decide whether it's worth spending the extra time to get what may be only marginally better quality (sometimes it makes a big difference, sometimes it's hardly noticeable, it depends on the source material and the end use).