How to reduce used memory for images

Question

I have ListBox with ~90 images. Every image has size = ~40Kb. Why application take 120Mb in memory?
How can i reduce using of memory?

P.S. all images is png 8. I can't load images on demand.

Answer 1

I'm facing the same issue. Also this memory doesn't go off if we navigate away from the page.

Answer 2

Take a look at this post on my blog:
http://blogs.msdn.com/b/swick/archive/2011/04/07/image-tips-for-windows-phone-7.aspx

Specifically, the part about "Image Caching", but the also the "Custom Decoding" section might help. I actually have a follow-up post in the works that highlights these two features specifically in the light of reducing memory. Just cleaning up my sample a little and will post it there shortly.

Thanks,
Stefan Wick - Microsoft Silverlight

Answer 3

The problem has been solved by replacing StackPanel with VirtualizingStackPanel.

Answer 4

Out of curiosity, can I ask you how much memory does the app take now with the VirtualizingStackPanel, considering the same scenario with ~90 images, each ~40KB in size and all png 8?

Thanks!
~raffaele