# CameraOrientationWidget Slow rendering with WASM

**URL:** https://discourse.vtk.org/t/cameraorientationwidget-slow-rendering-with-wasm/16099
**Category:** Support
**Tags:** trame, vtkwasm, python
**Created:** [October 19, 2025, 12:30pm UTC](https://discourse.vtk.org/t/cameraorientationwidget-slow-rendering-with-wasm/16099 "2025-10-19T12:30:38Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![Joe\_Tristano](https://discourse.vtk.org/user_avatar/discourse.vtk.org/joe_tristano/32/10300_2.png) [@Joe\_Tristano](https://discourse.vtk.org/u/Joe_Tristano)
#### Post date: [October 19, 2025, 12:30pm UTC](https://discourse.vtk.org/t/cameraorientationwidget-slow-rendering-with-wasm/16099/1 "2025-10-19T12:30:39Z")

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Hi,

I have a small trame app where I want some spatial awareness on the screen. Interaction and rotation of my actors is very fast without any spatial awareness widgets. When I add CameraOrientationWidget or if I add a poly data axis interactor, those widgets themselves interact very quickly without any graphical glitches. However, when I try to rotate the actual model, it is very sluggish. When the CameraOrientationWidget is used, it rotates just fine. However, as noted when I try to interact with the actual model, it is very slow. I tried to reproduce this by adding more and more cones in a simple app, but I cannot reproduce it that way. Are there any debugging tips to try and determine where my bottle necks are?

Thanks

Joe