KITFORMA · EDITORIAL ANSWER
How do I find the slow part of a Python program before rewriting it?
KitForma editorial guide. Guessing from source length often targets code that contributes little to actual runtime. Measure a representative workload first.
Step-by-step answer
Guessing from source length often targets code that contributes little to actual runtime. Measure a representative workload first.
Use
cProfile for call-level timing and inspect cumulative versus internal time. Separate I/O waiting from CPU work, and measure startup independently if that is the user-visible delay. Test the optimized version on the same input and compare correctness as well as time. Profiling adds overhead and a tiny synthetic input can change the dominant cost. Keep the raw baseline and state the workload, runtime and environment when reporting an improvement; a local speedup is not automatically a production latency guarantee.Sources and verification
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