Terrible Performance with 10g preview

I have serious performance problems with the 10g preview during basic operations.
Very frequently, it just locks up, using 100% CPU for 5-10 seconds.
It seems to occur every time I change window, for example
- double click on an error message in either the Compiler window or the Structure window and I have to wait 10 seconds before the cursor is active in the code editor.
- double click on a file in the navigator, 10 seconds before the opened file can be edited.
- click on an item in the HTML component palette
- close a code editor window. Can't use the next window for 10 seconds (this is less reliable than the others)
I am running NT4 SP6 on a PIII 500Mhz with 512M of memory. According to task manager, I am not using all the memory yet.

I hit the virus scanner problem when I first started using 903, but that is not the problem now.
Here is a dump produced as described.
Full thread dump OJVM Client VM (9.0.5.972 4dopv):
    "AWT-EventQueue-0"    prio: 6    state: runnable
    "AWT-Shutdown"    prio: 5    state: waiting for notification of monitor 0x1D1D7C24
        void java.lang.Object.wait(long)
            native code
        void java.lang.Object.wait()
            Object.java:426
        void sun.awt.AWTAutoShutdown.run()
            [locked monitor 0x1D1D7C24]
            AWTAutoShutdown.java:259
        void java.lang.Thread.run()
            Thread.java:536
    "Java2D Disposer"    prio: 10    state: waiting for notification of monitor 0x1D257D84
        void java.lang.Object.wait(long)
            native code
        java.lang.ref.Reference java.lang.ref.ReferenceQueue.remove(long)
            [locked monitor 0x1D257D84]
            ReferenceQueue.java:111
        java.lang.ref.Reference java.lang.ref.ReferenceQueue.remove()
            ReferenceQueue.java:127
        void sun.java2d.Disposer.run()
            Disposer.java:97
        void java.lang.Thread.run()
            Thread.java:536
    "WeakDataReference polling"    prio: 1    state: waiting for notification of monitor 0x1E4FB124
        void java.lang.Object.wait(long)
            native code
        java.lang.ref.Reference java.lang.ref.ReferenceQueue.remove(long)
            [locked monitor 0x1E4FB124]
            ReferenceQueue.java:111
        java.lang.ref.Reference java.lang.ref.ReferenceQueue.remove()
            ReferenceQueue.java:127
        void oracle.ide.util.WeakDataReference$Cleaner.run()
            WeakDataReference.java:88
        void java.lang.Thread.run()
            Thread.java:536
    "AWT-Windows"    prio: 6    state: runnable
        void sun.awt.windows.WToolkit.eventLoop()
            native code
        void sun.awt.windows.WToolkit.run()
            WToolkit.java:253
        void java.lang.Thread.run()
            Thread.java:536
    "IdeMinPriorityTimer"    prio: 1    state: waiting for notification of monitor 0x1F74216C
        void java.lang.Object.wait(long)
            native code
        void java.lang.Object.wait()
            Object.java:426
        void java.util.TimerThread.mainLoop()
            [locked monitor 0x1F74216C]
            Timer.java:403
        void java.util.TimerThread.run()
            Timer.java:382
    "IconOverlayTrackerTimer"    prio: 5    state: waiting for notification of monitor 0x1CFCA064
        void java.lang.Object.wait(long)
            native code
        void java.lang.Object.wait()
            Object.java:426
        void java.util.TimerThread.mainLoop()
            [locked monitor 0x1CFCA064]
            Timer.java:403
        void java.util.TimerThread.run()
            Timer.java:382
    "IconOverlayTrackerTimer"    prio: 5    state: waiting for notification of monitor 0x1E1D64E4
        void java.lang.Object.wait(long)
            native code
        void java.lang.Object.wait()
            Object.java:426
        void java.util.TimerThread.mainLoop()
            [locked monitor 0x1E1D64E4]
            Timer.java:403
        void java.util.TimerThread.run()
            Timer.java:382
    "TimerQueue"    prio: 5    state: waiting for notification of monitor 0x1D51E514
        void java.lang.Object.wait(long)
            native code
        void javax.swing.TimerQueue.run()
            [locked monitor 0x1D51E514]
            TimerQueue.java:231
        void java.lang.Thread.run()
            Thread.java:536
    "Finalizer"    prio: 8    state: waiting for notification of monitor 0x1CDFC134
        void java.lang.Object.wait(long)
            native code
        java.lang.ref.Reference java.lang.ref.ReferenceQueue.remove(long)
            [locked monitor 0x1CDFC134]
            ReferenceQueue.java:111
        java.lang.ref.Reference java.lang.ref.ReferenceQueue.remove()
            ReferenceQueue.java:127
        void java.lang.ref.Finalizer$FinalizerThread.run()
            Finalizer.java:159
    "Reference Handler"    prio: 10    state: waiting for notification of monitor 0x1CDFC124
        void java.lang.Object.wait(long)
            native code
        void java.lang.Object.wait()
            Object.java:426
        void java.lang.ref.Reference$ReferenceHandler.run()
            [locked monitor 0x1CDFC124]
            Reference.java:113
    "WaitCursorTimer"    prio: 5    state: waiting for notification of monitor 0x1F11E28C
        void java.lang.Object.wait(long)
            native code
        void java.lang.Object.wait()
            Object.java:426
        void java.util.TimerThread.mainLoop()
            [locked monitor 0x1F11E28C]
            Timer.java:403
        void java.util.TimerThread.run()
            Timer.java:382
    "main"    prio: 5    state: idle
    "VM Tasks"    prio: 1    state: runnable
    "Signal Dispatcher"    prio: 1    state: idle

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