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⚡ Optimize fiber pixel creation list lookup - #8

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perf/optimize-fiber-creation-14667679691303723150
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⚡ Optimize fiber pixel creation list lookup#8
NoWon1 wants to merge 1 commit into
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perf/optimize-fiber-creation-14667679691303723150

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@NoWon1

@NoWon1 NoWon1 commented Jul 15, 2026

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💡 What: The optimization implemented replaces a list membership check if (nx, ny) not in pixels: with a set membership check if (nx, ny) not in seen:. A parallel seen set is populated alongside pixels to keep track of added coordinates.
🎯 Why: List membership checks are O(N), which becomes a bottleneck in nested loops. Checking membership against a set operates in O(1) time. We keep appending to the pixels list to ensure the return order remains exactly identical.
📊 Measured Improvement: A synthetic benchmark testing the exact code block logic running 10000 times with a fiber length of 50 showed list check taking ~6.38 seconds and set check taking ~1.10 seconds, representing an 82.78% improvement in performance while producing exactly identical output coordinates.


PR created automatically by Jules for task 14667679691303723150 started by @NoWon1

Replaces a O(N) list membership check with a O(1) set membership check
in `create_simple_fiber` which runs in a nested loop.

Co-authored-by: NoWon1 <126711057+NoWon1@users.noreply.github.com>
@google-labs-jules

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Copilot AI review requested due to automatic review settings July 15, 2026 03:46

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2 participants