Improve performance of reusing SectionControllers by creating temporary dictionary #92
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This PR improves the performance of the SectionController reusing logic from
O(m * n)toO(m + n).Previously, for every section in the new list, a section with the same id was searched in the old list, meaning the old list was iterated for every item in the new list. Now this PR creates a temporary dictionary which offers constant time lookups and reduces the effort to one iteration of the old list.