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[cenwen <eolinwen@xxxxxxxxx>]

Severals things.
MLT doesn't use all the power of  the multithreading.  
We don't have introduced yet the module multiprocessing (http://docs.python.org/library/multiprocessing.html) for a optimization for the multi-architectures (dual core and quad core). I have a intel i5 750 too. 
The next version (1.1.0) will be more quick than now. (more speed than 1300%) see here : http://www.openshotvideo.com/2010/02/whats-next-stability-and-speed.html

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Poor thread utilisation
https://bugs.launchpad.net/bugs/519536
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Status in OpenShot Video Editor: New

Bug description:
Openshot doesn't seem to utilise multiprocessor CPUs very well.

I have an intel i7 920 (4 cores, 8 threads) - when encoding video openshot manages approx 130% CPU (i.e 1.3 threads on average). Kdenlive also uses mlt but runs an mlt-melt command line to do the rendering which manages 220% CPU