[DynamicArray] Reduce growth factor to 1.5

Author: lorentey

Sources/ArrayModule/DynamicArray.swift

@@ -261,7 +261,9 @@ extension DynamicArray where Element: ~Copyable {
 @_alwaysEmitIntoClient
 @_transparent
 internal func _growDynamicArrayCapacity(_ capacity: Int) -> Int {
-  2 * capacity
+  // A growth factor of 1.5 seems like a reasonable compromise between
+  // over-allocating memory and wasting cycles on repeatedly resizing storage.
+  3 * capacity / 2
 }
 
 extension DynamicArray where Element: ~Copyable {