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Delete temp. files / Clear the cache
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.
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 your device is slow because of a virus, which you have picked up while browsing the net or by installing insecure, modified applications, downloaded from third-party websites other than Google Play(store) or App Store.
System updates can improve the performance of your mobile device. That is why it is very important to check for updates frequently. Usually, your mobile device checks for updates automatically; however, it would be better for you to check for updates manually.
Even when you’re not using particular applications, many of them are running in the background, and as a result, your mobile device is slow. Sometimes it is useful to have applications running in the background, especially when you synchronize your email mailbox with your mobile device or refresh RSS feeds, but other times it’s just a drainage of resources.
To speed up your device, use an application like Greenify to freeze certain applications and processes until you actually need them.
Greenify helps you identify and put the misbehaving apps into hibernation when you are not using them, to stop them from lagging your device and leeching the battery, in a unique way.
You can download Greenify via Google Play(store), install it and let it speed up your device.
Custom Android launchers are a great way to optimize your device for performance and make it faster. They let you control the device's applications, allowing you to turn them off completely, thus making your device faster.
You can also try various degrees of animation speeds. In addition to that, you can also define new gestures, giving your Android device many new options.
Famous cuctom launchers include Nova Launcher Prime, Action Launcher, Google Now Launcher, Aviate, Apex Launcher etc.
Select one of them, download it via Google Play(store), install it and select your preferences.
The GPS feature can also slow down your device because it performs constant scans to update your location. If you don't need it, you can disable it to improve the performance (and the battery life) of your mobile device.