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Make sure that you have enough free disk space
The operating system requires a certain amount of free space (at least 1 GB) in order to function properly. If it lacks free space, the device becomes slow. A large number of personal data files such as photos, videos, music, applications, etc. can significantly slow down your mobile device.
Maybe the temp files and the cache are slowing down your mobile device. Temp files are created on a daily basis and a few of them don't pose a threat. But, too much temp files can definitely slow it down.
Multi-tasking does make it easy to switch between different tools, but as a result, the device's performance is decreased, due to lack of free RAM. To fix this (and to free up RAM), consider closing all the applications you don't use.
Every application installed in your mobile device runs in the background and slows it down, no matter whether you use the application or not. The best way to prevent applications from slowing down your mobile device is to delete them permanently.
If you have exhausted every method to fix your mobile device, there is only one more thing left to do. A hard reset is a solution to every software-related problem. It wipes down everything and it brings the device to the state it was in when it left the factory.