What do you mean how can you know? If the app isn't responding, I force-close it. That's all. >I have 15 apps "in memory", my phone started lagging I wish I c

What do you mean how can you know? If the app isn't responding, I force-close it. That's all. >I have 15 apps "in memory", my phone started lagging I wish I could tell you... I have 60+ apps 'in memory/suspended' always. I only close an app if there's an issue. I restart my phone maybe once a month, usually from a software update. The only ways I've seen my phone (iPhone 13, so two years old) lag is: - playing a demanding game and it gets too hot/throttles - using music via bluetooth + GPS + charging at the same time (gets too hot) - when opening 15+ new tabs in Safari simultaneously (like a group of bookmarks), weirdly makes the whole iOS UI stutter for a bit. I haven't been able to make it lag otherwise.