When to worry about cacheing?

Generally, you don’t want to go overboard when cacheing. Cacheing adds complexity, and you often don’t know where it’s needed. When you’ve finished adding a feature, you can test how long it takes using the {% now %} tag in your code and by calculating elapsed time inside of your Python code.

from datetime import datetime

…

start = datetime.now()

…

elapsed = datetime.now() - start

print "Time spent calculating swallow speed: ", elapsed