The word "procrastination" comes to mind.  I'm sure everyone experiences it at some point.  Sometimes you lose interest in what you are working on and your brain gets numb from focusing on the same thing for too long and you want to do something different.  I think that most of the time when I am slow at doing something, it is because it is difficult to do. Once I have developed the skills to do something, I can do it quickly and finish in no time at all.  For example, now that I am finally familiar with using Pose2Lux, I can set up a Poser scene and export it and start rendering it in LuxRender within 10 minutes or less whereas before, it took me a long time to apply the Lux materials to each material zone and set up the lights, etc.

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