Using the “wipe cache partition” functionality of the Nexus 7 Recovery tool has certain benefits, one of which I document here, and is recommended to be done after an update of the operating system or as a first attempt to fixing other OS problems before going to the extreme and doing a factory reset.
The steps below can be a bit tricky/finicky to get right so I suggest you read through them a couple of times first before attempting them.
Also apologies for the quality of the screenshots (taken on my digital camera) but there is no method of capturing screenshots in the state Android is in below as it’s before the OS has properly booted.
Disclaimer: This is not guaranteed to make your device faster, nor do I take any liability whatsoever for any issues that arise from following the below procedure
1. Power off your tablet.
2. Now press and hold Power + Volume Down until you see this screen:-
2. Use the Volume keys to select Recovery (press Volume Down twice), until your screen looks like below and then press Power to select.
3. You should now see the Google logo for 5-10 seconds before you see an otherwise blank screen with our little Android buddy looking worse for wear and the text “No command.”
4. Now you will press Power + Volume Up for about 3 seconds before releasing Volume Up (keeping Power pressed). That should land you at the screen below.
5. Again here, use the Volume buttons to move the cursor up or down. Press Volume Down 3 times to highlight “wipe cache partition” then press Power to select. (Be careful not to select “wipe data/factory reset”).
6. By now your cache should have been wiped clean, it took about 1~2 seconds on my Nexus. You will then have a confirmation message in the bottom left of the screen like the screen below:
7. Press the Power button with “reboot system now” selected (which should be selected by default) and your Nexus will boot up and hopefully be much more responsive and snappy!