Hi Andy,

Impedance is a measure of how slow the query is performing in terms of CPU usage, taking into account the amount of IO used. Sorting the results on Impedance will show you which queries are running relatively most slowly.

The results show which queries are relatively worse, i.e. a query that averages 4ms and the last run was 20ms will be ranked higher than a query that takes 5000ms on average but the last run was 6000ms (the former query is relatively slower but not absolutely).

Maybe you’re only interested in queries that take longer than an absolute amount of CPU usage. In this case you would need to change the first query to sort by [Last Time].

Hope this helps

Ian