One technique that has worked well in the Taligent Application Environment is to take things out one by one. Set up a timing harness for the code in question; then remove pieces of the computation one by one. This can be very helpful in pinning down where the time is going, something you can't always tell from other techniques. For example, when Taligent engineers worked on the View system, they thought it spent a lot of time in one loop. They put
return in front of the loop. The code no longer worked correctly, but it was possible to tell how much time it spent in the loop.
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