# zoom is slower when close to a model?!

**URL:** <https://community.cesium.com/t/zoom-is-slower-when-close-to-a-model/5308>\
**Category:** CesiumJS\
**Created:** [March 20, 2017, 4:17pm UTC](https://community.cesium.com/t/zoom-is-slower-when-close-to-a-model/5308 "2017-03-20T16:17:47Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Frederic\_Brodbeck](https://avatars.discourse-cdn.com/v4/letter/f/c68b51/32.png) [@Frederic\_Brodbeck](https://community.cesium.com/u/Frederic_Brodbeck)\
**Post date:** [March 20, 2017, 4:17pm UTC](https://community.cesium.com/t/zoom-is-slower-when-close-to-a-model/5308/1 "2017-03-20T16:17:47Z")

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hi,

it took me a long time to find out what is going on, but apparently zooming is slower when the camera is close-ish to a model. → [http://cesiumjs.org/Cesium/Apps/Sandcastle/?src=Hello%20World.html&label=Showcases&gist=4996eea48426f6b004ac21992e4c0456](http://cesiumjs.org/Cesium/Apps/Sandcastle/?src=Hello%20World.html&label=Showcases&gist=4996eea48426f6b004ac21992e4c0456) (zoom out slowly to notice the effect)  
why is that? and how can I disable this?

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**Author:** ![Frederic\_Brodbeck](https://avatars.discourse-cdn.com/v4/letter/f/c68b51/32.png) [@Frederic\_Brodbeck](https://community.cesium.com/u/Frederic_Brodbeck)\
**Post date:** [March 20, 2017, 5:05pm UTC](https://community.cesium.com/t/zoom-is-slower-when-close-to-a-model/5308/2 "2017-03-20T17:05:31Z")

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correction:  
it looks like it's not the proximity to the model, but the fact that the model is "in the center" of the view. — hard to tell though.

> **[Cesium Sandcastle](https://sandcastle.cesium.com/?src=Hello%20World.html&label=Showcases&gist=a4bc90cb451cc3c997566e34a655c5ca)**
>
> The Cesium Sandcastle provides an interactive environment for testing Cesium code.

if you change the value of `latOffset`in `getPositionCentered()` you will notice the difference.

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**Author:** ![Rachel\_Hwang](https://avatars.discourse-cdn.com/v4/letter/r/d78d45/32.png) [@Rachel\_Hwang](https://community.cesium.com/u/Rachel_Hwang)\
**Post date:** [March 20, 2017, 6:07pm UTC](https://community.cesium.com/t/zoom-is-slower-when-close-to-a-model/5308/3 "2017-03-20T18:07:56Z")

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Thanks for catching this! We’ve opened up an issue here: [https://github.com/AnalyticalGraphicsInc/cesium/issues/5131](https://github.com/AnalyticalGraphicsInc/cesium/issues/5131)

I’ve linked to this forum post in the issue so that we can notify you when we get a chance to look at it.

Thanks,

- Rachel