Numerous donuts on page

I've got a problem with a very long time of charts initialisation. It's quite specific case because there is about 30 blocks with charts rendered using ng-repeat (other hand the data is ultra-simle to show). All blocks are rendered, than app freezes for like 7 sec waiting for charts to show up. Is there any way to enforce asynchronous rendering of the charts or while ng-repeat is working? 