One of the disadvantages of retaining a phone after
the expiration of a two-year contract -- as many of us
do -- is that those older phones have accumulated a
few years' worth of digital gunk. They're clogged up like an aging sewer on the wrong side of town.
Just like on a PC, bits of app and OS code become
discombobulated -- orphaned from the parent
program. Onboard digital debris becomes disoriented
like a drunk stumbling out of a favored hole-in-the-
wall; jumbled lethargy sets in, and the device can take forever to start or become sticky in operation.
Well, just like a PC -- or a run-down apartment house,
for that matter -- you can freshen up a gloopy
smartphone. Here's how to go about speeding up a
slowing Android smartphone. Get Rid of Superfluous Apps The purpose of this procedure is not so much to free
space but to remove any apps that might be
performing poorly. Apps can contain all sorts of
trouble-prone, permissions-based polling, checking
and syncing. Step 1: Open the Settings area by touching the Settings cogwheel-like icon. Then scroll through to the
Apps menu item. In older versions of Android, it's
labeled Applications. Step 2: Touch the Downloaded tab and scroll through the list of apps. These are the apps that you've
installed over the years. Step 3: Touch the app label for any app that you haven't used in six months and press Clear Cache,
then Clear Data and then Disable or Uninstall,
depending on options proffered.
Tip: Be ruthless here and purge anything you're not
using -- it's a lot easier than identifying rogue
behavior app-by-app. Step 4: Test by restarting the phone and unscientifically identifying whether performance has
improved. Key benchmarks are time-to-start and
speed-of-scroll between home screens.
If the phone is feeling nimble again, you've identified
your issue. Make Some Space Step 1: Open the Apps menu item again from within Settings. Step 2: Choose Options and then Sort by size. Step 3: Scroll through the first few apps -- the most memory-hungry -- and clear the caches by pressing
the Clear Cache button within each App label. This will
free memory, allowing more operating headroom.
Then test. Step 4: Check storage by opening the Settings area again. Then scroll through to the Storage menu item.
View the Internal Storage graphical bar. If it's full,
with little space being indicated as available, install
LeveloKment's app Storage Analyser , available free in the Google Play store, and run it.
Tip: This app will identify the largest files on your
device -- files that may be phantom -- and allow you
to delete or move them off the device, thus freeing
space. Then test. Reinstall the Factory Stock
Software If the previous steps haven't solved the problem, this
likely will. Like rehab (or the drunk tank) for our
wrong-side-of-the-tracks inhabitant, this operation
may sound like a big deal and a lot of work, and
unfortunately it is, because you have to reconfigure
your apps.

Step 1: Open the Backup and Reset menu item from Settings and check Backup My Data along with your
Google account details if prompted.
Tip: Leave the phone connected to the Internet
overnight if you are newly creating a backup. This
will give the Google servers time to pluck the settings
data like WiFi connections and passwords, which it will restore later. You can skip this, but you'll have to
re-enter a bunch more stuff manually.

Step 2: Select Factory Data Reset from the same menu and follow the prompts to perform a full wipe
and OS reinstall.
Tip: Before a reset save, off-device, any internal
storage-stored media files, like captured
photographs. A reset wipes internal storage.

Step 3: Allow the phone to restart and follow the prompts to set up your Google account on the device
anew.

Tip: If your downloaded apps don't immediately
show, you can kick-start the installation from
Google's Play store My Apps menu item.

Step 4: Reconfigure your apps' settings. Tip: This is the tried-and-true method to get the phone
back to stock and a just-out-of-box state. Avoid
restoring from backups in this case because you may
reintroduce the issue or issues.

source http://www.skipchange.com/2016/05/how-to-speed-up-sluggish-android.html?m=1

as if when u restore d files u backed up it wont slow it again .. no b same MB and virus wan still enter??

klassykute:
as if when u restore d files u backed up it wont slow it again

Nice reply