i noticed that my nexus suddenly become very slow and lags..
i mean, really really slow..
it takes 3-4 second to load an app like whatsapp, browser, message, etc..
sometimes it needs to force close because it took so long to load..
my storage still got around 7gb..
may i know what should i check to rectify this problem?

i only rooted my phone, and update to 4.2.2..
didnt change any other than that..
basically using stock..
previously everything was fine..
it just happen suddenly like a week ago..

what should i do if my phone stuck in fastboot mode
and the toolkit shows < waiting for device > ??

i just flashed new rom.. revoltJB.. just to test..
i thought after flash new rom, everything will be gone?
as we already wipe everything before flashing?
how come after i flash new rom, my storage still got only 5gb left as previously? seems like nothing is wiped?

google play starts downloading/updating all my apps as soon as i finish setup my phone..
and i can still notice some lags even after flashing new rom..

so if i wanna have a fresh clean install, like when i get new phone, then how?