Bug 771176

Version:
Devel env, last commit's hash: 80cdab3dd6434384b206d73bb950fec6a7bab6e9, with additional few jboss7-related patches
jboss 7.1.0 Beta1b
Firefox 7.0

Scale tested:
-------------
* ~250 Data Centers
* ~250 Clusters
* ~250 Hosts - each one in seperate data center and seperate cluster
* ~250 vms - all in one data center and one storage

User experience:
----------------
* It takes few seconds to select one item from a main tab's grid, the item is not always selected in the first trial.

* It's almost impossible to select dozens of objects (multiple selection), the right-hand scroll bar is almost non-responsive, and when I do manage to select multiple objects - it takes ~30-60 seconds to the items to be selected.

* Moving between main tabs sometimes takes few seconds, although most of the time it's quite fast.

The overall experience is bad!

Firefox:
--------
* Most of the time is almost non-responsive

* Almost any attempt to close it ends with "Force Quit"

* CPU - 100% of one core, the client's machine is 4 cores' cpu, Intel Core i5 M 540 @ 2.53GHz

* Memory - ~2 GB RAM


Long lists:
-----------
* Lists with scroll bar (I don't mean to drop-down lists that show only one object before clicking on them) with ~250 objects sometimes appear in the most uppper-lest corner of the browser and "move" to their place only few seconds after that.

Dialogs:
--------
* Some of them appear without buttons or without other controls in them for ~3 seconds.