That's very strange. Could it be that your lists have allot of data? That could cause these dropdown to take a while.
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Paul T.
Aside from that, it's hard to tell what's going on. You would have to really dig in and try to understand were the bottleneck is.
Marc,
Just thinking here. I have not looked at the code for the SPDisplayRelatedInfo, but do you remember whether the calls for data are synchronous? I think SPCascadeDropdown is.
I don't envision that utility to be an issue, but again I have not looked.
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Paul T.
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