If the problem is, to many resources in the tree, try to use collections for that resources.
No, the problem is repeated on all contexts, it doesn't matter is it one resource inside or 10. On places where i have a bunch of resources i'm using collections and gridclasskey.
discuss.answer
The problem probably solved, after I removed conten of cache directory from core directory. I will follow situation and when it will appear again. Now everything work fine... thanks..