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[Boris von Loesch <612579@xxxxxxxxxxxxxxxxxx>]

I forgot to say, that this affects mostly small systems. 
Changing the mesh to UnitSquare(200,200), the speedup is not that dramatic anymore but the second code is still 40% faster.

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Huge performance problem in Python interface
https://bugs.launchpad.net/bugs/612579
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Status in DOLFIN: New

Bug description:
In my Python Code I need to evaluate a nonlinear functional many times. This was rather slow and after a profile run, I've noticed that 90% of the time was spent in the __init__ routine of form.py to compile the form. As far as I can survey the code, this should be necessary only once. 

I have attached a simple example that illustrates the effect. In my test, the second code is roughly 40 times faster.