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200404011800 build, PIII 800MHz, 512MB, JDK1.4.2_03 Sometimes component closing causes rebuilding of XML tree that is expensive operation and may last for a few seconds. It can be reproduced by opening some bigger document, invoking reload document and closing editor. This takes more than 4 seconds on openide/api/doc/changes/apichanges.xml file.
Created attachment 14330 [details] threaddump during component closing
The bug was fixed by fixing 41856.
IMHO, it's fine in recent DEV (4.0) builds