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[Johan Hake <612579@xxxxxxxxxxxxxxxxxx>]

I fixed caching of the swig version, which decreased the difference to
15 (still quite large). If ufl.algorithm.preprocess is called on the
form before throwing it into assemble the difference is decreased to
2.5.

Is there any way to turn a form that is assembled into a preprocessed
form Anders? Another way to get around this is to allow a user to give a
dolfin.Form to assemble. Not sure this is what we want as it clutter the
interface.

If no other good suggestions comes in I will close this bug.

Johan

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

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.