Delay doing operations

Hello group,

I'm currently doing a drone project with arduino nano, MPU6050 sensor, RF24, GY511 magnetometer and 4 brushless motors.
I have used several libraries in order to make the control of the 3 angles; roll, pitch and yaw. The libraries were:

#include <I2Cdev.h>
#include <Wire.h>
#include <MPU6050_tockn.h>
#include <LSM303.h>
#include <PIDController.h>
#include <Kalman.h> 
#include <AsyncServoLib.h>

The code works properly and it gaves me the correct PWM signals in the serial monitor when it is just connected to the computer, but when its time to energize the 4 motors it becomes very very slow and it updates the data more 5 or 6 seconds after the signal error has changed.

Does any body have an idea of what may be the problem and how can I fix it?
I´m currently using 22,174 bytes out of 30,720 bytes of the memory program and 57% of the dynamic memory.

Thank you!

Are you still sending data to the serial connection, which is broken, now. Make all the serial.Print() stuff all comments and try again.