This problem is observed when a user
launches and closes a popup window repeatedly. Doing so in certain
conditions will show that the popup window takes longer and longer
to display.
In order to observe this behavior the following conditions need to
be satisfied.
- On the popup page there must be many symbol set objects each
with many array symbols on each.
- The popup window is closed and re-opened repeatedly.
The cause of performance degradation is the act of freeing the
page as you are able to launch the same popup window repeatedly
with only a minor performance impact. As soon as you close a popup
and launch another one however performance impact is then
noticeable. Performance interesting does improve however if you
continue to launch popup windows without freeing them.
Our investigations into this issue has lead us to believe that this
performance degradation is due to the processes memory heap
fragmentation when the window is freed. This is because there are
so many small objects located on the page so there is extra
overhead when re-using this memory when the next popup is
launched. |
