Performance difference


sorry… but english is not my mother language - I hope you still understand my post.

I have 2 questions about the timer performance in UE4.

Is there a big performance-difference between A and B ?
(Look at my attached screenshot.)

Of course… 3 timers are more than 1 timer ^^
But what is the difference exactly when when I use 100 or more timers instead only 1 timer?
Can I ignor the performance-loss or could be problematic?

And finally a question: Is there a performance difference between simply use an event-tick or use a fast timer with a looping periode of 0.01666 seconds (=60 FPS) ?