Originally Posted by suba_ri
WhatsApp works fine when I'm sending a picture that was previously saved.
This kind of behavior happens also with Kik, Facebook messenger, and in general;
When I update any application, the phone becomes almost unresponsive for 10-20 seconds, every single time.
Here is the screenshot from androbench: https://db.tt/KAoi3zoX
I created this screenshot and it took 10 seconds for the phone to start reacting normally again..
I experienced lots of different behaviors, sometimes even with the same configuration. Becoming unresponsive for a while when updating apps isn't uncommon. I experience that, I'm sure lot's of users around here do. You could try changing the sdcard readahead to 2048 and see if makes a difference (or to 1024, etc..) and see what configuration your friend's phone is using. You can also use Kernel Tuner, Performance Control or any tweaking app which allows you to change governors / cpu frequencies / sdcard readahead to changes these things.
Also, OOM values can also influence the user experience (these can be checked / changes using Kernel Tuner for example).
Will run Androbench soon as I can and i will post and compare.
Alright here's mine - Although there are differences (specially on the sequential write), I don't think it's exactly that, that is causing your issue.
Can more users do the test with Androbench and post their results ?