angular-ui/ui-grid

Fast scrolling causes lockup at bottom

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#3,903 opened on Jul 1, 2015

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help wantedseverity: memory leakseverity: performance

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Description

I observed this on the 401 tutorial. I scroll down with the scroll wheel as fast as I can. When I hit the bottom, the last few rows take several seconds to render. Long enough for me to capture the attached screenshot. I also took a profile, but didn't try to analyze it.

I am using Chrome 43 on Windows, and currently have lots of CPU and memory available on the system.

401 scroll profile

Contributor guide

Research direction
Investigate the scroll event handler to understand why rendering is delayed at the bottom. Look at the profile screenshot to identify performance bottlenecks in the row rendering pipeline.
Tech stack
javascript
Domain
frontend
Issue type
Bug
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.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
JavaScriptAngular
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40