Update Performance.md

changzhihao · Feb 27, 2020 · e255d4a · e255d4a
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 ## Note
 
 References to `Sys.Coll.Imm` are Microsoft's `ImmutableCollections` library.
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+* `Sys.Coll.Imm.List` is `System.Collections.Immutable.ImmutableList`
+* `Sys.Coll.Imm.Dictionary` is `System.Collections.Immutable.ImmutableDictionary`
+* `Sys.Coll.Imm.SortedDictionary` is `System.Collections.Immutable.ImmutableSortedDictionary`
+* `Sys.Coll.Imm.SortedDictionary` is `System.Collections.Immutable.ImmutableSortedDictionary`
 
 
 ## Lists