OOo 2.0.2 leaks pixmap memory

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I'm running OpenOffice 2.0.2 in headless mode to convert SXW files to PDFs. Conversion usually takes place in under a second, but after a certain number of documents are converted, conversion takes 3 to 5 seconds.

When I use xrestop to connect to the X server (either Xvfb or Xvnc), I notice that the number of pixmaps in memory goes up and down as OOo draws on the screen, but not all pixmap memory is reclaimed once OOo closes its document window. This leak causes pixmap memory to fill up, eventually leading to poor performance. The performance hit occurs when around 16MB of pixmap memory is used.

When I connect to the Xvnc server, I can see that each window element (scroll bar, toolbar, etc) is being re-drawn over and over again. This behavior only occurs when OOo has been running for awhile. My current workarounds are to disable as many on-screen elements as possible, and restart OOo on a regular basis. Is there another way around this?