Choose Setup from the Options menu.
Performance Meter displays the Setup dialog box.
Specify a new sample interval (in seconds) in the Sample Every selector.
The number you specify must be a whole number between 1 and 9 (inclusive). If you are viewing performance on-screen, a low interval such as 3 seconds may be appropriate; if you are logging samples to a log file, a higher interval is useful for restricting the size of your log file.
Click Apply to make your changes take effect.
Performance Meter samples at the specified rate for this and all future sessions, until you change the value in the Sample Every selector again.