I disagree with Khan's assessment, also, but I think it depends largely on how you use your device. It's my understanding that when you use an app, much of it's info stays in memory even after you close the app so that next time you open it, it opens faster. If you use that particular app often, that's probably a good thing. If you're like me (a casual user), probably not. That app, which is "semi-open" is using memory and storage, checking for notifications, etc., slowing the device down. For example, I check the weather in the morning and then I don't need the app again the rest of the day, with some exceptions. I see no reason for the app to be sitting there doing things and wasting space when I'm done with it. Another example and huge resource hog: I don't have a Facebook page, but my band does. I check it in the morning and at night before I go to bed. Does it need to run all day telling me every time somebody posts something? No. When I want to know what's going on there, I'll look. In fact, I shut off notifications for every app I don't need notifications from. Otherwise, they are constantly checking for what I consider useless information, or at least information that can wait until I'm ready to see it. In fact, and this is off track a bit, but nonetheless useful. If you go to settings- applications- application manager- you can go down the list of apps and shut off notifications for any apps you don't want connecting. Also, a lot of apps upload usage data and you can disable this feature in the settings of many of the apps. IMO, closing unused apps, stopping notifications, opting out of uploading usage data, etc. not only makes the device run faster, but also substantially improves battery life. This part isn't just a theory. I've proven this with the devices I own.
Edit: Another reason to opt out of notifications and usage data uploads is that it can substantially decrease the amount of data you use if you are on a limited data plan. Surprisingly, I've found that Clean Master itself is one of the worst offenders. You'll want to uncheck "apply holiday themes", "user experience program", all of the weather settings, and "notifications" (unless you want them). Other apps will have similar settings.
Edit: Another reason to opt out of notifications and usage data uploads is that it can substantially decrease the amount of data you use if you are on a limited data plan. Surprisingly, I've found that Clean Master itself is one of the worst offenders. You'll want to uncheck "apply holiday themes", "user experience program", all of the weather settings, and "notifications" (unless you want them). Other apps will have similar settings.
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