It may be tempting to ''close all'' but you won't really get the performance boost you want. The second of these two
statements is pretty much accepted as common knowledge by anyone even
passingly familiar with how app caches and RAM work in Android, but the
first statement is not as commonly understood. This is why the
developer of Greenify, a great app you can use to hibernate apps that have a tendency to stay up past their bedtime, decided to clear things up. To give you the super
simple explanation (which we've covered in greater depth before), when
you launch an app it gets stored in random access memory. When you close
it, it stays in your RAM so that if you launch it again it will launch
must faster. When you force close or swipe away an app in the recent
apps list, you effectively clear out that cached app and the next time
you launch it, it will be like you're doing it from a fresh boot. This
means it takes longer and requires more system resources. Depending on how into your RAM and CPU usage you are, there's lots of tools available.
Now, when you have a recent apps list that's 20 apps long then it
makes perfect sense to clear away the ''one-off'' apps that you opened
once and probably won't open again in the near future. This clears up
RAM for other tasks and, on a practical level, you probably don't need
those apps stored in memory anyway. In this instance, swiping away
unused apps can be a useful way to free up some additional RAM for other
tasks. But clearing all of your recent apps creates slow down later on. Some RAM managers only clear out the least used apps in your recent apps list.
The same thing goes for task killers and RAM boosters, which simply
kill everything: cached apps and background processes. The same problem
arises when you launch the app again. If you've cleared it from memory
it takes longer to launch, and if you've killed background processes
they usually just start up again after a short period of time. So for
freeing up RAM in the short term these are perfectly fine, but as a
general remedy for improving performance they are nothing more than a
panacea. The Android OS gives you all kinds of data that lets you assess how demadning your apps are.
If you know how these tools work then using them is fine, but most
people don't quite get the mechanics of how caches work and why they are
actually a good thing. Take Android L's ART (Android Run Time), for
example: by pre-compiling apps once and keeping them stored in RAM,
you'll notice significant increases in app launches and responsiveness.
This is a good thing, and there are several reasons why Google is making
ART the default runtime in the next version of Android.
This is also why the dev behind Greenify, Oasis Feng, decided to illuminate us with the following pearls of wisdom:
Swiping away apps from recent tasks frequently is not a good
practice, since it reduces the efficiency of process cache mechanism in
Android, thus impact the performance of your device.
Swiping away apps from recent tasks kills the process of those apps,
thus prevent them from being cached in memory. When you launch them
later, it takes longer time and much more CPU cycles to create the
process and re-initialize the app runtime.
Clearing recent tasks does free much memory, at the expense of later
performance and battery consumption for launching those apps again. So
if you have a device with 2G RAM, it gains no benefits in practice.
Coming from a developer involved with an app that is very well
recognized for managing your apps, background processes and processor
consumption, you can assume he knows what he's talking about. So, the
moral of the story is this: clearing everything from the recent apps
list is a waste of time unless you seriously need every inch of RAM
available right there and then. Clearing out apps you're not going to
switch between regularly however, is perfectly fine. So, your frequently
used apps can stay and everything else can be killed with fire. Simple.
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