I have a database which is getting a lot of calls to the following procedure:

    exec dbo.SM_SP_MAILEVENTNAMES 167260

In Profiler using the TSQL_Duration trace these calls show up as:

    EventClass: RPC: Completed
    Duration:   900 to 1500 ms
    Reads:      8818 

Running the same query in Management Studio with Statistics I/O:

    set statistics io on
    exec dbo.SM_SP_MAILEVENTNAMES 167260

Runs instantaneously and has the following I/O output:

> Table 'SM_MAIL_CONTACTS'. Scan count 0, logical reads 29, physical reads 0, read-ahead
reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.<br>
> Table 'SM_MAIL_EVENT_CONTACTS'. Scan count 13, logical reads 68, physical reads 0,
read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.<br>
> Table 'SM_MATTER_EVENTS'. Scan count 1, logical reads 3, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.

The query itself returns about 3 rows.  Why the disparity in what I am seeing in Profiler and Management Studio?