If you're like me, you've had a Nexus 7 for a while now and use it quite often. If you're like me and approximately 90% of the grouper owners, you've noticed a catastrophic rise in lag since 4.2 was released. Yesterday, I was perusing the ye ole Reddit when I noticed a discussion regarding this very same event. It appears most of the discussion centered around Asus' SSD and I/O controllers, with the former degrading over time. True or not, I couldn't really tell you. Still, I pressed on undaunted, tried a few tips, and lo and behold, they work! Sort of.
First, I wiped the cache in recovery. Why? Because I did.
Second, I downloaded this and ran it. I may run it again, because it's like acupuncture for your SDcard directory. In short, it populates the "free" space of your storage with blank files, then permanently removes them, ensuring that no lingering, past-deleted files exist to slow down everything.
This app will fill your SD Card with many blank files(*.blank), then delete all of the *.blank files.
This will ensure all deleted files on your SD Card are overwritten and cannot be recovered by any File Recovery Apps.
Third, I removed SwiftKey and Chrome from the device. SwiftKey takes absolutely for-fucking-ever to load, and I've seen trials that went to the jury in a shorter time than Chrome takes to initially load a page.
Results? A bit of the ole snap is back, but whether it lasts remains to be seen. If the SSD truly "degrades" over time, as stated in the Reddit thread, I have a feeling that I'll be searching for a replacement tablet sooner rather than later.
Anywho, if your grouper is slow and you want to (briefly) rekindle its snappy magic, try the above and let me know what happens.