I am trying to run down some perf issues in my app. So I select a time period and get this:



I click on the highlighted line and get the following in the source view:



I don't understand how instantiating a Dictionary can cost 3.4 seconds. Am I missing something here?

Stats:
v7.3
Profiling mode: LIne-level and method-level timings; only methods with source (detailed).