I've seen memoization improve performance by enormous amounts. Even for simple functions that do a few simple calculations before returning a result. Another

I've seen memoization improve performance by enormous amounts. Even for simple functions that do a few simple calculations before returning a result. Another go-to of mine is to take conditionals out of loops that really only need to be checked once. For example: for foo in whatever: for bar in foo: if len(foo) > some_value: do_something(bar) Can become: for foo in whatever: if len(foo) > some_value: for bar in foo: do_something(bar) This example is trivial and wouldn't gain much but imagine if `len(foo)` was a more computationally expensive function. You'd only need to call it on each iteration of foo instead of every iteration of foo * bar.