Chosen box with huge data - Performance issue

When using chosenbox with huge data as in the example provided there is a potenially big performance issue.
The example logs all calls to getElementAt() in the custom ListModel implementation.

steps to reproduce:
1. focus the chosenbox inputcomponent
2. type "aa" (dropdown appears, with 10 items ("aa0" - "aa9") -> OK - getElementAt() called for these 10 items)
3. select e.g. "aa3" using keyboard press [return]-key
4. press [tab] so enter the next input component
5. press [shift+tab] to return to the chosenbox component
--> getElementAt() will be called 50000 times (the return value of getSize() of ListModel) !!!
--> getElementAt() will be called again 13324 times (basically called from 0 through index of previously selected item)

6. start typing again e.g. "b"
--> getElementAt() in list model will be called another 13324 times

--> (dropdown appears, with 10 items -> OK - getElementAt() called for these 10 items)

the numbers will increase as the models size returns larger size, or items with higher index are selected