There is a simple solution to fix the keyboard lag on the Samsung Galaxy S6, Galaxy Note 5 and Note 4. The Galaxy S6 and Note 5 might be the best devices out there with 3-4GB of RAM, but the poorly optimized TouchWiz skin really decreases the user experience.
One of the biggest complaints that users have with the Galaxy S6, Note 4 and Note 5 is aggressive RAM management. Even though these devices are equipped with 3GB and 4GB of RAM, apps do not stay open for a long time in the background. That’s thanks to Samsung’s SPCM service which kills all tasks in the background.
This service also affects the keyboard experience. If you are a typist, you can definitely see a minor lag between the moment when you press the screen and the moment when the phone picks up the touch and transmits it to the keyboard to insert a letter.
The Android 5.1.1 Lollipop update doesn’t help with the keyboard lag problem either. However, with everything related to Android, there is a fix, which requires root. If you have a rooted Galaxy S6, Note 5 or Note 4 you can fix the TouchWiz keyboard lagging issue.
How to fix keyboard lag problem on S6, Note 5, Note 4
You need a rooted Galaxy phone. If your device is not rooted, check our guide on how to root Galaxy S6, Note 5 and Note 4.
- Go to the Play Store from your phone and download ES File Explorer.
- Open ES File Explorer and go to the root system of your phone.
- Find a file called build.prop. Tap and hold the screen. Open the file using a text editor.
- Find the following line: sys.config.spcm_enable=true
- And replace it with: sys.config.spcm_enable=false
This will deactivate the annoying SPCM service which kills apps for more RAM. This will fix the Swiftkey keyboard lag on the Galaxy S6, Note 5, Note 4 and other Galaxy devices.
On a computer, this kind of problem turned out to be much more difficult. I was not able to connect the keyboard the first time, but a friend told me what drivers I need to download for this, and I found the logitech keyboard driver here