Hi,
It is centainly not a best practice to load 7000 objects in your page. Some browsers can handle it (Chrome), but IE probably not.
Maybe you could try to solve this by using steps which applies filtering.
We've once had this problem with the calendar widget, which did not apply the XPath constraint well and loaded all database entries. The browser memory usage was above 1 or 2 GB and the browser page crashed every time.
KR,
Bart