xamarin/Xamarin.Forms

[Android] ScrollView Performance is worse when page is not the root

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#4,778 opened on Dec 17, 2018

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a/performancee/7 :clock7:help wantedinactivep/Androidt/bug :bug:up-for-grabs

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Description

Description

Issue originally reported by @mikescandy: https://twitter.com/mikescandy/status/1072985823006605314

Steps to Reproduce

  1. Use https://github.com/mikescandy/ScrollTest
  2. Compare the modal loading/scrolling time to the non-modal loading/scrolling time.

Expected Behavior

Performance is the same regardless of how the page is served.

Actual Behavior

Performance appears degraded when the page is modal.

Basic Information

  • Version with issue: 4.0.0.8055-pre1
  • Last known good version:
  • IDE:
  • Platform Target Frameworks:
    • iOS:
    • Android:
    • UWP:
  • Android Support Library Version:
  • Nuget Packages:
  • Affected Devices:

Screenshots

see Twitter link

Reproduction Link

https://github.com/mikescandy/ScrollTest

Contributor guide

Research direction
Profile the ScrollView rendering on Android when used in a modal page vs root page. Compare the layout and measure passes to identify performance differences.
Tech stack
csharp
Domain
mobile
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.
1-2 days
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.
Mostly clear
Prerequisites
Git
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30