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Build 200503011900 1) Have a WebApp 2) Projects view, Libraries node - context menu | Add Library 3) Select all libraries, OK (add them) 4) Select all libraries in Libraries node 5) context menu, Remove 6) ERROR: It takes 6 secons on my machine Java takes 1-2 seconds WebApp in build 200502241900 takes 2 seconds. BTW: probably similar problem as Andrei solved in issue 54160?
The problem was caused by saving the project file after removal of every library. This resulted in regenerating build-impl.xml.
Created attachment 20703 [details] fix
Verified in 200503061900.