When I installed the FB application, the size was 49MB. As recommended, I then move it to the SD Card. I expected that the memory internal usage would not be so congested. The app was working fine initially. But later, the app and my phone was working very slowly, and many times stopped working. Then I checked, and I found the memory usage's status is very different between installation and the current. There are 237MB memory occupied (after I cleared cache the memory), and only 55.88MB stored on SD Card.

Then my question is, where is the rest of the app is stored? In internal memory? How do I solve my phone from being very slow?

  • There is a lite version of this application designed for low memory device. You should try it
    – esQmo_
    Mar 4, 2019 at 21:20
  • Yes, that FB Lite I also installed. But there is limitation with the number of characters I can write in the status. It limited me to write my though. Mar 5, 2019 at 1:32

1 Answer 1


49 MB is the size of the installer, the install itself will be much larger. And moving an app to external storage does not move every component of an app, you will never get a 100% data move.

Not sure who advised you to move facebook to external storage, but it is best practice to leave apps on the default install location (interal memory for most apps). External storage is not directly attached to the phone motherboard, and MicroSDHC SDXC card speeds are lower than internal soldered-on memory. So unless you are running critically low on space for internal memory, leave facebook in (or move it back to) internal memory.

Also, don't have both facebook and facebook lite installed. It's a resource burden and may even cause conflicts. For the sake of speed, go with facebook lite if you can. But uninstall one of them.

About cache clearing. Although "cache cleaners" and similar tools look good, a cache clear is at best ephemeral and at worst annoying as all the apps that needed cache in the first place need to repopulate. The exception that proves the rule is facebook...clearing cache once in a while frees up a ton of memory and noticably improves performance. Facebook cache is the one cache item I do delete manually from time to time.

If an uninstall of one of your two facebook apps, and a move back to internal memory, and a facebook cache clear don't help, you'll need to investigate other possibilities.

  • Quote: Not sure who advised you to move facebook to external storage, but it is best practice to leave apps on the default install location, I did it just because I worried that the internal memory will not be enough. I normally did it as more apps installed, the more slow the phone. I will try to reinstall it and leave in internal memory to see if it is help. Mar 5, 2019 at 5:37
  • In addition to facebook, I suggest moving as many other apps as possible back into internal memory. I would leave at least 200-300MB free for proper OS function but other than that, unused memory is wasted memory.External memory is best used for user files such as documents, pictures, videos, music etc.
    – clg
    Mar 5, 2019 at 6:19

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