I profiled your code (0.2.41ubuntu2) and on my computer the bottleneck is this 
statement:
  SourcesList()

The slow part of that is that it reads the info files in
  /usr/share/python-apt/templates/
every time.

And the slow part of that is that it tries to translate the
descriptions.

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https://bugs.launchpad.net/bugs/598282

Title:
  command-not-found slow for its task

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