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Research: Profiling web-edit with Python 3.15: flame graphs and source heatmaps Simon Willison’s Weblog Newsletter 12th October 2026 Research Profiling web-edit with Python 3.15: flame graphs and source heatmaps — Profiling the unmodified web-edit app with Python 3.15’s built-in profiling.sampling revealed that mixed line-ending preservation dominated a busy editing workload: preserve_endings appeared in 64.8% of 15,296 recorded CPU stacks, with SequenceMatcher.find_longest_match contributing 38.3% of leaf samples. Sampling all threads was essential, since 95.1% of stacks came from AnyIO’s worker thread and would have been missed by a main-thread-only profile. I put the new Python 3.15 profiler through its paces by having GPT-6 Astra Extra High in Codex run it against my new web-edit app: I need a Python 3.15 flame graph and heatmap demo of the "web-edit" app from PyPI - research first then make me those demos Here's the resulting example flame graph and heatmap. Recent articles Hello Python 3.15, goodbye 3.10, and now I can use 3.11 - 12th October 2026 A new feature for my blog, built using my voice - 9th October 2026 Claude Haiku 5.5 - 7th October 2026 We're going to need default hard budget caps on pretty much everything - 3rd October 2026 This is a beat by Simon Willison, posted on 12th October 2026. profiling 23 python 1,291 codex 61 Monthly briefing Sponsor me for $10/month and get a curated email digest of the month's most important LLM developments. Pay me to send you less! Sponsor & subscribe Disclosures Colophon © 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026