Delete removed widget performance feature

Author: ConnorLand

content/en/docs/releasenotes/studio-pro/11/11.6.md

@@ -13,8 +13,7 @@ mts: true
 {{% button color="info" href="https://marketplace.mendix.com/link/studiopro/11.6.4" text="Go to Marketplace" title="Download version 11.6.4 from the Marketplace" %}}
 
 ### Improvements
-    
-- We improved performance for repeatable containment widgets that contain an input widget, when not running the React client. This improvement is particularly noticeable in scenarios where a Data Grid 2 widget has multiple columns configured with custom content containing input widgets. (Ticket 251521)
+
 - The macOS installer now includes the Mendix Version Selector. This enhancement allows macOS Studio Pro users to open applications directly from [Apps](https://sprintr.home.mendix.com/link/myapps), double-click MPR/MPK files to open them, or send stories to Studio Pro from the **Plan & Build with Maia** flow in Mendix Portal.
 - We renamed Studio Pro on macOS to Mendix Studio Pro.
 - We improved handling of cases where a user is deleted concurrently while a session is retrieved for the same user.