Amend docs and README based on info from Nikolay

README.md

@@ -81,8 +81,9 @@ you, but if you want to also enable it in other scenarios and in standalone appl
 `enableNewSwingCompositing()` function in your Compose entry points (that is, right before creating a `ComposePanel`).
 
 > [!NOTE]
-> The new Swing rendering pipeline is experimental and may have performance repercussions, especially on Windows, where
-> HW acceleration is not yet available.
+> The new Swing rendering pipeline is experimental and may have performance repercussions when using infinitely
+> repeating animations. This is a known issue by the Compose Multiplatform team, that requires changes in the Java
+> runtime to fix. Once the required changes are made in the JetBrains Runtime, we'll remove this notice.
 
 ## Need help?
 

core/src/main/kotlin/org/jetbrains/jewel/foundation/Compatibility.kt

@@ -5,8 +5,7 @@ import org.jetbrains.jewel.ExperimentalJewelApi
 /**
  * Enables the new compositing strategy for rendering directly into Swing
  * Graphics. This fixes z-order problems and artifacts on resizing, but
- * has a performance penalty on Windows (as of 1.5.1) because there is no
- * DirectX HW acceleration. Linux and macOS have HW acceleration though.
+ * has a performance penalty when using infinitely repeating animations.
  *
  * We assume the majority of our users will want this flag to be on, so
  * this convenience function is provided to that end. Make sure you call