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Profiling web-edit with Python 3.15: flame graphs and source heatmaps
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Summary
Profiling the unmodified web-edit app with Python 3.15's built-in profiling.sampling showed that mixed line-ending preservation dominated a busy editing workload. preserve_endings appeared in 64.8% of 15,296 recorded CPU stacks, and SequenceMatcher.find_longest_match accounted for 38.3% of leaf samples. Sampling all threads mattered because 95.1% of stacks came from AnyIO's worker thread, which a main-thread-only profile would have missed.