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IsVirtualizing="True" loads tiles faster, however scrolling lags now

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Jonathon
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Jonathon asked on 01 Nov 2011, 08:45 PM
Hi,

I have a lot of items being displayed on the page. When I set IsVirtualizing="True", the tiles load up faster, however, now when I try to scroll through them it lags pretty bad. Is there a reason why scrolling is now performing poorly and is there a way to fix it?

Thanks,

Jonathon

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Petar Mladenov
Telerik team
answered on 04 Nov 2011, 02:02 PM
Hello Jonathon,

During the virtualization process, the RadTileViewItems are generated when you scroll up and down.That is why the performance depends on the type of controls you use in the TileViewItems. For example you cannot expect great performance if you have thousands of RadTileViewItems that contain RadGridViews.
Having this in mind, could you please elaborate more on your scenario so that we would be better able to investigate it and advice you ? Thank you in advance.

Kind regards,
Petar Mladenov
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Jonathon
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answered on 04 Nov 2011, 06:36 PM
Hi Petar,

There are 4 images using a string to object converter, 25x25pixels, a close button to the right of maximize, 6 textblocks with images to the left of each, and a headeritemscontrol that acts like a grid. Taking out the headeritemscontrol it performs a little better but still lags if you move the scrollbar. The amount of tiles on the screen is usually between 12 and 44 tiles.

Thanks,

Jonathon
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Zarko
Telerik team
answered on 09 Nov 2011, 04:04 PM
Hello Jonathon,
I created a sample project from your description - a TileViewItem with 10 images, 6 textblocks and a button and it is performing ok according to me. With UI Virtualization it's normal to have a some lag when you scroll because if you scroll fast at some moment the RadTileView will have to generate 3-4 rows or 21 - 28 RadTileViewItems which is a lot.
You may increase the performance by decreasing the number of tiles in a row - this means less containers for generating on scrolling.
Also if the loading time without virtualization is not very long (1-2 secs) you may try to use the RadTileView without the virtualization.
I've attached the my sample project and if you have more questions please feel free to ask.

Best wishes,
Zarko
the Telerik team

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Petar Mladenov
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Jonathon
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Zarko
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