[Nexus 7 General] nemrel:
Two of the most important Apps I'm using ATM to control & root out the lag issues are Diagnosis & Trust: Event Logger both by TheDarken. Both have free & paid unlock versions. The paid versions are worth the price & allow you to customize just about everything you want.

Trust keeps a database log of every app install, uninstall, & update. It also logs other information. That helps me backtrack if an app screws up & lags my tablet. Very useful!

Diagnosis places a completely customized data overlay on my screen of various data. Right now mine is configured to tell me the current total CPU data, total apps running, current memory usage, download speed, upload speed, each cpu core 1-4 usage, memory read & write speeds, & any apps/processes that are currently using a certain CPU threshold. It sounds like a lot of information but it's nicely overplayed on the screen with customization of font, font size, spacing, font color, & if you want any background behind the information. I have it set to log 3 days worth of information & it's starts as one of the first apps when during boot.

Diagnosis is very interesting. Usually my total apps actually running is around 1 to 3 total & I hardly ever have an app running at more than 45% CPU. Which shows in a complete lack of lag. Now when I start my tablet I can have up to 13 apps running for a few. Which shows some lag. This coupled with a logcat viewer can help me root out problem apps/processes.

Apps I have found to stall my tablet are the usual Google ones everyone is listing here: Currents, Play Store, Play Magazines, & Play Movies. However the biggest hog I have found, which will cause my boot times to enter the 10 minute mark, is Google Wallet. It causes a ton of general lag when I enable it. This is the current updated version. Clearing Wallet's App Data & Cache fixes the lag & boot times.

Now onto the other noticeable issue most of you are having is lag with touch screen inputs & dragging. I have found that my touch screen lag happens due to a grounding fault. I have zero data or log proof of this but it could be highly possible - due to the immense screen issues a lot of us are having.

If you want to test this out simply turn on the Show Touch Points & Touch Coordinates in the Development System Settings, under Touch options & follow one or both of these instructions.

TEST ONE: Take your tablet out of any case you have it in. Now turn off your tablet's screen (not a complete power off cycle). Put your device on a wooden table or similar surface. Turn it back on without holding it. Notice touch lag or missed touches? You probably do see straight lines that are not straight.

TEST TWO: Hold your tablet in your hands. Turn the screen off again. Place a finger on your blank screen. With your finger on the screen turn the screen back on with your other hand. Now move your finger around the screen. Notice lag in the touch? On my device if I run my finger along the right side of the screen another touch point mysteriously appears on the left side of the screen & jumps around as if I have two fingers on the screen. Here's a picture of it:

With either test just turn off the screen & turn it back on while holding it in your hands & only touching the case - not the screen. The lag & missed touch points stop immediately.

Don't do these tests too often or for too long though. When I do I usually have a couple days of input lag & missed touches. What I have found to help straighten this out is if I keep the show touch points (the small white circle) setting on while using the tablet. It isn't a perfect solution since the screen/software is still somehow messed up. I barely ever see the touch points under my fingers so I figure no biggie.

I'm sorry for the super long post. I'm hoping it helps some of you out. Either by giving some of you more information in you battles with cpu lag & input lag. Maybe you'll decide the screen is worth doing an return or complete refund with you tablet.

I also know I sound like a shell for TheDarken, but I love these two apps & the have helped me keep things straight after having super unresponsiveness, cpu lag, & screen input issues. (BTW: SD Maid is also awesome for tablets & phones with SD cards!)

Feedback? Comments? Please share.

Sent from my Nexus 7 (rooted, but running stock rom/kernel after a factory reset & 2gb free space) using Tapatalk 2.

---------- Post added at 05:20 PM ---------- Previous post was at 05:17 PM ----------

One thing with Diagnosis is that you cannot have it running/logging during new app installs & updates.