Sometimes Kindle Paperwhite eBook reader starts to run (really) slow and you have to wait some time almost every single time you press for the next page. The method that worked for me was:
Press the power button for about 20 seconds/until your Kindle resets. After it reboots, your eBook reader should run smoothly.
Keep in mind:
- Reset is not equal to Restart that appears when you press the power button for ~5 seconds.
- This method should not erase anything from your device