How to fix Samsung Galaxy S8 that started running slow after Android 8.0 Oreo update (easy steps)

Some users of the Samsung Galaxy S8 have contacted us asking why their phones started to perform poorly after the major Android 8.0 Oreo update. According to some, freezes and lags started to manifest after updating their devices. There are also those who said that the update may have messed up their phones because they now take too long to open apps. Poor performance is pretty annoying especially if you are used to having a phone the normally runs very fast but this problem is actually one of the most common issues any smartphone owners may encounter.

In this post, I will walk you through in troubleshooting your phone to determine what the problem really is and what you should do to fix it. I will suggest things you can do to try and make your device run faster again. If the problem started after and update, there’s always a chance that it’s just temporary and you may be able to fix it on your own without any help from a technician. So, if you’re one of the owners of the Galaxy S8 that started to run so slow after an update, continue reading as this post may help you.

Before anything else though, if you have other issues with your device, then visit our troubleshooting page for we have already addressed several common problems with this phone. Odds are that there are already existing solutions to your problems so just take time finding issues that are similar with yours. If you can’t find one or if you need further assistance, feel free to contact us by completing our Android issues questionnaire. Please provide us with as much information as possible so that it would also be easier for us to troubleshoot the problem. Don’t worry as we offer this service for free, so all you have to do is give us sufficient information about the problem.

How to fix Galaxy S8 that runs so slow after the Oreo update


Based on my personal experience, this kind of problem is only with the firmware although there is also a possibility that some of your apps have something to do with it. That’s the reason why you need to troubleshoot your phone and with all that being said, here’s what I suggest you do.

Reboot your Galaxy S8 first – before doing anything complicated, make sure to restart your phone because this problem could be just a result of a minor glitch in the system or the hardware. Glitches can easily be fixed by a reboot and more often than not, your phone will work perfectly after that. However, if the device still runs very slowly after a reboot, then you have to move on to the next step.

Run your phone in safe mode – by doing this, you’re temporarily disabling all third-party apps which may be the cause of the problem. So, continue using your phone like you normally do and observe it closely so that you would know if the device works faster in this mode because if it does, it’s a sign that points to your downloaded apps to be ones that cause the problem, although there could only be one or two apps that has something to do with it. Find that app and uninstall it to make your phone run perfectly again.

Wipe cache partition – assuming your phone is still slow in safe mode, the next thing you must do is delete all the system caches so that they will be replaced with new ones. There’s a possibility that some of them got corrupted or became obsolete after the update. If the firmware continues to use those files, performance issues may occur like this one. To delete the system cache, you have to reboot your phone in recovery mode and wipe the cache partition from there. You may refer to the next steps below to know how to do it.

Do the Master Reset – lastly, you have to do the master reset if the previous methods failed to fix the problem. A reset will bring the phone back to its factory settings and configuration. If the issue is with the firmware, then a reset is all it take to fix it. However, bear in mind that all your files and data will be deleted. So, you have to make a backup before doing this procedure as you may not be able to retrieve them once their erased.

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The following are procedures used in this troubleshooting guide…

How to boot Galaxy S8 in Safe mode

  1. Turn the device off.
  2. Press and hold the Power key past the model name screen.
  3. When “SAMSUNG” appears on the screen, release the Power key.
  4. Immediately after releasing the Power key, press and hold the Volume down key.
  5. Continue to hold the Volume down key until the device finishes restarting.
  6. Safe mode will display in the bottom left corner of the screen.
  7. Release the Volume down key when you see Safe Mode.
  8. Uninstall apps that are causing a problem.

How to wipe cache partition

  1. Turn off the device.
  2. Press and hold the Volume Up key and the Bixby key, then press and hold the Power key.
  3. When the Android logo displays, release all keys (‘Installing system update’ will show for about 30 – 60 seconds before showing the Android system recovery menu options).
  4. Press the Volume down key several times to highlight “wipe cache partition.”
  5. Press the Power key to select.
  6. Press the Volume down key to highlight “yes” and press the Power key to select.
  7. When the wipe cache partition is complete, “Reboot system now” is highlighted.
  8. Press the Power key to restart the device.

How to reset your Galaxy S8

  1. Turn off the device.
  2. Press and hold the Volume Up key and the Bixby key, then press and hold the Power key.
  3. When the green Android logo displays, release all keys (‘Installing system update’ will show for about 30 – 60 seconds before showing the Android system recovery menu options).
  4. Press the Volume down key several times to highlight “wipe data / factory reset.
  5. Press Power button to select.
  6. Press the Volume down key until ‘Yes — delete all user data’ is highlighted.
  7. Press Power button to select and start the master reset.
  8. When the master reset is complete, “Reboot system now” is highlighted.
  9. Press the Power key to restart the device.

I hope that this troubleshooting guide have helped you one way or another. If you have other concerns you want to share with us, feel free to contact us or leave a comment below.

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