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XamComboEditor display delay when ItemSource is large

I've got an issue where viewing the entries in a XamComboEditor takes many (10s-30s) seconds to display, and then it also takes a long time to render the items in the list as I scroll through it.  I have ~30,000 entries in this list.  I have tried to limit it to ~10k entries but the issue persists.

Is there a setting or a configuration I can implement to speed up the display time?