firefox-devtools/profiler

Moving the mouse over a line of the Marker Chart containing many markers is janky

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#3,217 opened on Mar 11, 2021

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help wantedmarkersperftimeline

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Description

Example profile with many marker: https://share.firefox.dev/3erEIt3

It was displayed fullscreen on my 27" hidpi external screen, that likely didn't help.

Here is a profile of the janky interaction: https://share.firefox.dev/3vfwABR

┆Issue is synchronized with this Jira Task

Contributor guide

Research direction
Analyze the performance profile linked in the issue to identify the bottleneck in marker chart rendering when hovering. Focus on the event handling and repaint cycles.
Tech stack
typescript
Domain
frontenddeveloper experienceperformance
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
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.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
GitTypeScript
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70