How to throttle the rate of test execution ?

I need to be able to slow down the frequency of test(), for testing websites that limit the number of page requests per minute (per client ip address).
I see a “startup delay” parameter in urlblast.ini, which may allow me to achieve this with IE8 (?)
How would I achieve this throttling with other browsers/test-agents ?
)referring to page requests, I am making 9-test runs per URL.

Are you running multiple test agents? If so you might want to disable test sharding (sharding=0 in the settings or API) so that the tests at least run sequentially and not in parallel.

Otherwise there’s no good way to pace all of the tests automatically. If you just need it for one URL you can use a scripted test and just include a sleep before starting the navigation.