# ReadPixel slowly web gl

**URL:** https://discourse.vtk.org/t/readpixel-slowly-web-gl/11877
**Category:** Development
**Tags:** vtkwasm
**Created:** [July 5, 2023, 8:30am UTC](https://discourse.vtk.org/t/readpixel-slowly-web-gl/11877 "2023-07-05T08:30:00Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![mazurkin.daniel](https://discourse.vtk.org/user_avatar/discourse.vtk.org/mazurkin.daniel/32/7277_2.png) [@mazurkin.daniel](https://discourse.vtk.org/u/mazurkin.daniel)
#### Post date: [July 5, 2023, 8:30am UTC](https://discourse.vtk.org/t/readpixel-slowly-web-gl/11877/1 "2023-07-05T08:30:00Z")

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Hello, there is a problem when using ReadPixel for transferring 3D Slicer tools to the browser. This issue was discovered through graphics execution profiling. What are the possible solutions to this problem?

 ![image](https://discourse.vtk.org/uploads/default/original/2X/c/c3834645fdf6300cc468f22bb80b1fd345a25805.png)