Do you have a multitude of filters in your dashboard? As you know the more filters you add to a dashboard, the more it will slow down performance.
However, if you do need those multiple filters, you can enhance your performance by adding an Apply button. In essence, the filter will not apply the changes to your dashboard until you hit the Apply button.
How do you do this?
Click on the down arrow next to your filter. *Please note, your filter must be set-up as a Multiple Values Drop-down filter.
Click on Customize and then select Show Apply Button.
Now when the user selects your filter, they click on the check boxes they want to select and then click on the Apply button at the bottom of the filter.