Since you are posting in the helicopter section, I am guessing that you have oscillations when you try to fly. LibrePilot does not have an option to change the "loop time" like some other firmwares.
The correct way to fix that is to adjust the PIDs in the Stabilization tab. I would start with flying Rate mode and adjust the "Rate Stabilization (Inner Loop)". Note that this mode does not do "automatic levelling" so you must be able to fly without that. Yes, it is a bit of "chicken and egg" to fly a more difficult mode to start to set up so you can fly an easier mode.
After that you can fly in Attitude mode and adjust Attitude Stabilization (Outer Loop) PIDs. Don't play with Acro+ until you are a very good pilot. Responsiveness section allows you to adjust the Attitude mode 55 degree max bank angle to some other value and the Rate mode max rotation rates (default is 220 degrees per second).