Awfully slow in loading main apps like messages, contacts, phone.. Why?!
You don't have enough internal RAM. Try stopping as many applications as possible. In Android go to settings (Gear symbol) Apps, then scrol down to those apps you don't need right now, select them, then on the next screen select force stop. Force stopping an app should stop it dead in it's tracks. The next time you need that app, simply click on it's representative icon, and it will start up. This means of course that these apps won't be doing what you want them to do, while they are stopped. For example, an e-mail app won't be checking for e-mail, etc. Depending on your version of Android, some phones allow you to prevent apps from auto starting on boot up. You can select which apps, such as Messenger, e-mails, etc., need to start on boot up and which don't. Because of limited memory your smartphone has to cycle the apps into RAM, perform the required request, then cycle it back out to internal memory again so it has room for the next function it needs to perform. All functions are performed in RAM, all apps run in RAM, you only have so much room, then the phone has to swap out apps. The more apps vi-ing for RAM, the slower the phone. I currently use "Mobile Manager" on my ASUS Android to manage which apps start on boot/reboot, and which start when I select their Icon. I also use an app called "No Root Firewall" which sets up an internal VPN on my phone, that allows me to stop all network activity and limit access to the internet to only those apps I want to let out. This cuts down on needless background downloads (Ads) which also tie up CPU time. Not all apps can use external memory. External memory is usually used to store things like pictures, music and docs.
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