(I wasn't finished and hit the enter key, sorry...)
So when i run these lines above, the memory goes up steadily: the memory consumption of the Internet Explorer increases continuously. The symptom applies for Firefox too. The size of memory allocated over time is not so tremendous in this case. However, updating an expanded tree with lots of nodes where each of them nests a couple of other components (e.g. h:inputText) results in the increase of the memory usage of up to 1MB per update!!!
Anyone solved this issue?
Regards and thanks for comments on this.