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Ok so obviously there is an issue when you are bringing a significant amount of data from a related TO into an IWP screen with a portal. What I have ended up doing is setting the whole screen up to use a standard list layout.
However I am having issues with long value lists that are generated by a field. So I am assuming this is also a limitation in IWP.
Now looking to try and fix this again through List layouts.
My issue is that I want to assign a client to a case/project but when I click the drop down list with the client id and full name it takes around 30 seconds to bring back a value list with around 3000 entries (on the client you get this in less than a 2 seconds).