Why is my Nexus 7 tablet slowing down so much?

Episode 1240
Dave fromDave also wants to know why the Nexus 7 slows down so much? Leo recommends doing an update. The latest versions of Android have "trim" which streamlines the RAM, making the tablet run faster. Should he upgrade to the Nexus 9? Leo says no. There are better options out there like the Samsung Galaxy Tab. The Nexus 9 is too expensive and a bit clunky.