Thanks for that. Please check that you have selected one of the 'All methods inc. framework' profiling modes and that the Display Options dropdown above the call tree is set to All Methods.
If there are 'collapsed insignificant methods' below the HttpModule in the call tree, you can click the '+' to expand those nodes, but they are unlikely to cause a performance problem.
I don't think this sort of server load will be causing a problem displaying results from HttpModule, but if you still can't see the HttpModule types, please email your profiler settings to firstname.lastname@example.org
with the URL of this forum thread in the subject line.