... before or after drying each load of laundry.

Angie's How To Inspect Your Dryer and Dryer Duct
Did you know there are approximately 15,000 dryer fires every year in the U.S., and most of them occur because lint builds up in the dryer or the exhaust duct? A lint-clogged exhaust duct can also push warm, moist air into your wall cavities and attic, encouraging mold growth and potentially starting a fire!
3 pros!
...vacuum out the lint screen housing.
... remove the duct that connects your dryer to the duct in your wall. Vacuum out the back of the dryer, the dryer duct, and the wall duct as much as possible. Take care when reattaching the duct and pushing the dryer back into place that the duct does not detach from the wall or dryer, and that it doesn't kink or crush.
...removing any blockage and lint. Turn the dryer on when you are finished and make sure that you feel the exhaust air from the dryer exiting your home.
... free of clutter.