Udf Oddities

I have been experiencing some wierd udf behaviour.
I have a udf that takes 7.5 mins to run.  The sql inside the udf runs in < 1s.
Run the query under index tuning wizard and it suggests a very odd index.
Adding the index gets the time for both down to < 1s.

I have a second udf that is not as condusive to the index tuning wizard.


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