ListView in WP8 pretty Slow

Maybe someone has a good idea for my problem:

I do have a app with a ListView containing a lot ImageCell items.
The whole thing works really well and fast in iOS and Android. But on WP8 it's pretty slow.

As I see, the WP-ListView-Renderer creates a LongListSelector.
According my understanding, this Control does not support Virtualization and does not allow me to change that.

I'm aware I could write a ViewRenderer and do it my own... but maybe there is a better solution - since I think it's a common use case for a list to have many items.

best, adrian