Article ID : 00243041 / Last Modified : 03/02/2022Print

Why is my phone slow after a software update? (Android 9.0, 10)

    IMPORTANT: This article applies only to specific products and/or operating systems. Check Applicable Products and Categories for details.

    Valid for

    • Android 10
    • Android 9


    If you experience that the device runs slower after a software update when, for example, entering menus or opening applications, try these troubleshooting tips. The order has been ranked from easiest to more difficult. 

    Wait for two days to see if the performance improves

    When you have performed an Android system update, it may take up to two days for the device software to stabilise. Some processes initiated by the update will continue running in the background for some time, for example:

    • The indexing of files.
    • The updating of pre-installed apps. The apps are updated when the device is turned on and connected to the internet for the first time after the update.

    The processes running in the background are using the processor a lot, causing the device to be temporarily perceived as slow for a day or two. This behaviour is normal during indexing and app updates.

    Restart the device

    If the device is still slow two days after the update, restart the device to see if the performance improves.

    Perform a factory data reset

    Back up any important data saved on the internal memory of your device, and then perform a factory data reset.

    Note! A factory data reset will erase all data on the internal memory. Content on an SD card will not be deleted. You should backup personal content, such as contacts and media files from your device to an SD card or to a cloud backup service (online account). Alternatively, you can make a backup to a computer using the Xperia Companion computer software.

    To perform a factory data reset

    1. Back up any important data that is saved on the internal memory of your device to, for example, an SD card or to a cloud backup service (online account). If you have any encrypted files stored on an SD card, you should also remove the encryption to ensure you can still access them after the reset.
    2. Find and tap Settings → System → Advanced → Reset options → Erase all data (factory reset) → RESET PHONE.
    3. If required, draw your screen unlock pattern or enter your screen unlock password or PIN to continue.
    4. To confirm, tap ERASE EVERYTHING

    Perform a software repair

    If you haven't done so very recently, back up any important data saved on the internal memory of your device, and then perform a software repair.

    To perform a software repair

    1. Make sure you know your Google account username and password. Depending on your Xperia device's security settings, you may need to enter them to start up your Xperia device after a software repair. Tip: If you don't remember your Google account username or password, you can try to recover them using the Google Account Recovery page.
    2. Computer: If not already installed, download and install the Xperia Companion application.
    3. Open the Xperia Companion application.
    4. Under Manage your Xperia, click Software repair.
    5. Follow the on-screen instructions.

    Format your memory card (SD card)

    Try formatting the memory card. Formatting the card removes all files and folders, including any leftover data and corrupted files. You find detailed instructions on how to format the memory card further down this page.

    Note! Back up any important data before formatting the memory card. You can use a file manager to move the memory card content to a computer.

    To format the memory card

    1. Find and tap Settings → Storage.
    2. Tap SD card → the menu icon (three vertical dots), then tap Storage settings → Format → FORMAT SD CARD.