App is lagging and tends to Crash

[Nils.Sky]

Hey,

so I still have not found an answer to the issue. I tried changing the buffer Size to 512 which also didnt help...
I am using the default example code for the Bluetooth Mega connection via a HC05 Module.
I have set the request time of my bluetooth Module to 0.5s and got a baudrate of 9600. 

Would be really greatful for any tipps or help regarding that issue!