angular-ui/ui-grid

perf(refreshCanvas): Running too often?

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#2,139 opened on Nov 18, 2014

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help wantedseverity: performance

Description

In pulling some simple CPU profiles it seems like a disproportionate amount of time is spent recalculating header heights when they haven't changed... There should be a way to skip this while scrolling as it's unneeded.

However we can't simply do the calculation once and be done because toggling grid options could theoretically alter header height.

Contributor guide

Tech stack
javascriptangular
Domain
frontend
Issue type
performance
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
JavaScriptAngularJSUI Grid internals
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
35
Research direction
Investigate the refreshCanvas function to identify where header heights are recalculated. Implement caching or skip recalculation when heights haven't changed, but ensure that toggling grid options triggers update. Profile to verify improvement.