Does killing background apps make an Iphone faster?

Does killing background apps make an Iphone faster?

Added (1). You mean drain more battery constantly with killed background apps then it would with lots of running background apps? Or just drain battery at those few seconds that I'm killing the background apps?

Yes, however, it may also drain your battery

Of course it does. You can't just have a bunch of stuff open and expect it to be the same speed.

Yes, it will increase battery life and it will make it faster as background apps are using your phones RAM which will make it run slower.