feat: Optimize measureText helper function in sync_fusion library#3
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savio-nazario-tractian
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Apr 10, 2026
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Note
To test it this change use this pull request from the app.
What is changing
Creating a TextPainter and calling .layout() allocates Flutter rendering objects — expensive when chart axes call measureText for the same label text + style dozens of times per build pass. Added a
200-entry LinkedHashMap-backed LRU cache keyed on (textValue, textStyle, angle). Cache hit returns immediately with no allocations.
The original code made 8 passes over the 4 corners (4× .map() + 4× .reduce()). Replaced with a single loop that tracks min/max for X and Y simultaneously.
Example & Tests
Testing in A36 on profile mode
Screen_recording_20260410_095758.mp4
Screen_recording_20260410_102350.mp4
Why?
As you can see in the devtools 10% of the cpu time is spent in this function.