Our p2 based on installer suffered performance issue when querying IUs from repositories. Though the repositories have a large number of IUs to be queried, but we find the performance of using QL is unacceptable in some special scenarios.
I published several different methods to find the expected IUs. Thomas pointed out the better expression of QL and finally helped us to find out the our repository without IIndexProvider implementation.
IIndexProvider implementation of a repository is quite important to improve the performance of QL, especially use the 'traverse' clause to query something.
And Slicer API is an alternative method when querying the complete dependencies.
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