Fault with AJAX UpdateProgress?

I'm using one of the UpdateProgress indicators on an UpdatePanel. I have
about 3 "options" to chose from, 1 which puts 0 items in a table, 1 that
puts 1 in the table, and 1 which puts 100's of items in the table.

When flicking between the first 2, everything performs as expected -
very quick updates, and no progress indicator as it happens in < 1 sec.
When I click on the third option, the progress indicator displays as
expected. However, when then I click on one of the first 2 options,
there is no progress indicator, but the update takes ages - I am
guessing that the client side script is busy cleaning out the 100's of
items, but not considering that to be part of the overall progress? And
when I say ages, it seems to be twice as long as loading the items in
the first place.

Surely the progress indicator should be triggered if it's taking the
AJAX client script a long time to "clean up"?

Dino

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