SQL Server Performance Tuning: New function in SQL 2016: sys.dm_exec_function_stats
Returns performance statistics for cached functions. Returns information about scalar functions, including in-memory functions and CLR scalar functions but not about table valued functions. The view returns one row for each cached function plan, and the lifetime of the row is as long as the function remains in memory. When a function is removed from the cache, the corresponding plan is no longer available in the view.
OBJECT_NAME(object_id, database_id) ‘function name’,
total_elapsed_time/execution_count AS [avg_elapsed_time],
FROM sys.dm_exec_function_stats AS
ORDER BY [total_logical_reads] DESC
More information from Microsoft can be found here: https://msdn.microsoft.com/en-us/library/mt429371.aspx
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