Changes.md : Update to summarise recent performance improvements

GafferHQ · Jul 11, 2023 · b5dbb62 · b5dbb62
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@@ -110,6 +110,7 @@ API
 - Handle::AngularDrag : Added `isLinearDrag()` method.
 - Widget : Added per-widget control over colour display transforms via new `setDisplayTransform()`, `getDisplayTransform()` and `displayTransform()` methods.
 - VisibleSet : Added `VisibleSet::Visibility` struct containing `drawMode` and `descendantsVisible` members.
+- ValuePlug : Improved `getValue()` performance, particularly when retrieving previously computed values from the cache. One benchmark shows a 50% reduction in runtime when the cache is under heavy contention from many threads.
 
 Breaking Changes
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