# VTKJS is so slow on MAC

**URL:** https://discourse.vtk.org/t/vtkjs-is-so-slow-on-mac/12842
**Category:** vtk.js
**Tags:** vtkjs
**Created:** [December 5, 2023, 2:39am UTC](https://discourse.vtk.org/t/vtkjs-is-so-slow-on-mac/12842 "2023-12-05T02:39:53Z")
**Posts on this page:** 1
**Page:** 1

<div class="post-metadata">

### Author: ![LY226](https://discourse.vtk.org/letter_avatar_proxy/v4/letter/l/a183cd/32.png) [@LY226](https://discourse.vtk.org/u/LY226)
#### Post date: [December 5, 2023, 2:39am UTC](https://discourse.vtk.org/t/vtkjs-is-so-slow-on-mac/12842/1 "2023-12-05T02:39:53Z")

</div>

When VTKJS renders a large grid, it is stuck on a specific MAC, and Threejs can be rendered smoothly. (1) Under the mac, Firefox and Safair can be rendered smoothly; (2) Chrome can also be rendered smoothly when the user-anonle = metal is opened.  
How can I automatically adapt to mac’s metal rendering engine like threejs?