How to Force Stop multiple apps at once?

My HTC One X+ with Android 4.2.2 suffers a lag pretty often and I don't like that. Sometimes I cannot even unlock the phone because screen doesn't come up. I noticed that when I force stops all other apps (besides the one I am using) when phone lags, it runs smooth. I have lot of apps installed so going to Apps then selecting the app and then force closing it takes a lot of time. I am looking for a way where I can force stop multiple apps at once.