Startup delayed by org.eclipse.debug.ui

We've noted lately in our RDi installs that it takes some time for the application to start up. What is common across all these is when it is on the IBM Rational Developer for i 9.5.1 screen. In the lower left of the window it shows what it is loading. When it gets to org.eclipse.debug.ui, it suddenly stops for as long as three minutes. Afterwards it completes the startup and you are able to use the product. Then there are other times it flies through this and the startup takes anywhere between 10 and 15 seconds. Does anyone have any idea why loading this particular UI causes this?
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