react / react/react-native

React native does not support screen refresh rate

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#29,333 57 comments 85 reactions 0 assignees View on GitHub

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Description

Please provide all the information requested. Issues that do not follow this format are likely to stall.

Description

When running a react native app on a device that has a refresh rate other than 60, react native apps still run at 60 fps.
This means that if you have a device like a Samsung Galaxy S20, which runs at 120 fps, every react native app will feel sluggish, slow and underperforming.

React native should honor the screen's refresh rate and use that for rendering.

React Native version:

Run react-native info in your terminal and copy the results here.

System:
    OS: macOS 10.15.5
    CPU: (8) x64 Intel(R) Core(TM) i7-7820HQ CPU @ 2.90GHz
    Memory: 791.56 MB / 16.00 GB
    Shell: 3.2.57 - /bin/bash
  Binaries:
    Node: 12.16.1 - ~/.nvm/versions/node/v12.16.1/bin/node
    Yarn: 1.19.1 - ~/.yarn/bin/yarn
    npm: 6.13.4 - ~/.nvm/versions/node/v12.16.1/bin/npm
    Watchman: 4.9.0 - /usr/local/bin/watchman
  Managers:
    CocoaPods: 1.9.1 - /usr/local/bin/pod
  SDKs:
    iOS SDK:
      Platforms: iOS 13.5, DriverKit 19.0, macOS 10.15, tvOS 13.4, watchOS 6.2
    Android SDK:
      API Levels: 21, 22, 23, 24, 25, 26, 27, 28, 29
      Build Tools: 25.0.0, 26.0.1, 26.0.2, 27.0.2, 27.0.3, 28.0.2, 28.0.3, 29.0.0, 29.0.2
      System Images: android-16 | Google APIs Intel x86 Atom, android-19 | Google APIs Intel x86 Atom, android-21 | Google APIs Intel x86 Atom_64, android-22 | Google APIs Intel x86 Atom, android-23 | Google APIs Intel x86 Atom, android-23 | Google APIs Intel x86 Atom_64, android-24 | Google Play Intel x86 Atom, android-25 | Google APIs Intel x86 Atom, android-25 | Google Play Intel x86 Atom, android-26 | Google Play Intel x86 Atom, android-29 | Google APIs Intel x86 Atom, android-29 | Google Play Intel x86 Atom, android-P | Google Play Intel x86 Atom, android-Q | Google APIs Intel x86 Atom
      Android NDK: 21.0.6113669
  IDEs:
    Android Studio: Not Found
    Xcode: 11.5/11E608c - /usr/bin/xcodebuild
  Languages:
    Java: 1.8.0_152 - /usr/bin/javac
    Python: 2.7.16 - /usr/bin/python
  npmPackages:
    @react-native-community/cli: Not Found
    react: 16.11.0 => 16.11.0 
    react-native: 0.62.2 => 0.62.2 
  npmGlobalPackages:
    *react-native*: Not Found

Steps To Reproduce

Provide a detailed list of steps that reproduce the issue.

  1. Use a phone with a higher refresh rate than 60 (e.g. Samsung Galaxy S20, Oneplus 7T (or higher))
  2. Start any react native app
  3. See that the app is slower than every app on the phone

Expected Results

I expect that the app runs smooth on all refresh rates above 60.

Snack, code example, screenshot, or link to a repository:

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the issue on a device with a refresh rate above 60 Hz, such as a Samsung Galaxy S20 or OnePlus 7T, using a React Native 0.62.2 app. The payload names no repository files or tests, so the rendering and frame-scheduling implementation will need to be located first. Done means React Native apps render smoothly while honoring supported device refresh rates above 60 Hz.

Written by the indexing model from the issue text.

Assessment

Tech stack
react-native
Domain
mobile-dev, performance
Issue type
Feature
Difficulty
5/5
Estimated time
Over a week
Activity status
Quiet
Clarity
Mostly clear
Newbie friendliness
38/100

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