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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.
If you tried everything to speed up your mobile device but nothing worked, consider buying a new mobile device. If you are not sure which device to select, ask a salesperson, who will help you make the best choice according to your needs.
Note: Don't buy mobile devices from unauthorized dealers because there are many cheap copies out there.
If you decide to go out and buy a mobile device out of an authorized store, click here to read this useful article , and open the IMEI registrar, where you can enter your device's IMEI (to find out your device's IMEI dial *#06#, or look under the battery if it is removable) and check if your device is genuine or not.
If you have made too many modifications to the settings of your mobile device, you might have made it slower. In this case, a simple reset to the factory settings (without any data loss) will speed it up.
Most often, a mobile device gets slow when an application tries to access the Chrome browser in order to display you an online content (a certain web site, video, image, etc.)
Chromer is a free application designed to reduce the time it takes for Chrome to load the webiste, i.e. it allows any application on your mobile device to take advantage of chrome custom tabs. In other words, Chromer gives every application its own custom internal browser.
The advantages of chrome custom tabs are:
Minimal distractions from the application you are using
Pages load relatively faster
You don’t need to login to websites again
Your forms are auto filled if you have auto fill enabled
You can use chrome’s data saver feature
Your browsing experience is secure with latest security updates
Download it via the Google Play (store), install it and set it as a default browser (when the pop-up window appears)
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.
If you were unable to speed up your mobile device and tried everything, try restoring it from a backup (provided that you have already created one).
To restore a mobile device from a backup file:
In the Zune software, click Settings -> Phone -> Update -> Restore -> Follow the on-screen instructions in the Zune software
After you've completed these steps, your phone will be restored to its state from the most recent available restore point. You can see this date to the right of the Restore button (everything you have installed after you've made the backup will be deleted)
Note: If you have a Windows phone version 8 and above, all you need to do is to log in with the account you used previously (after you've hard-resetted the phone).