If you type something in a Word document and then highlight the text, right click on the text and select "Lookup", winword.exe takes about 50 % CPU on a dual core processor and 90% + in a single processor and it could take around 30 + seconds until the right Research pane opens. If we do the same process on a machine where MS-Office 2003 is install on the base the whole process to open the research pane takes around 3 to 5 seconds.
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Windows 7 and XP
MS-Office 2003 SP3