Rosserial doesnt work when subscribing to the cmd_vel Topic at 9600 baud

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Hello guys, I have the following issue: rosserial or much rather my arduino cant keep up while subscribing to cmd_vel topic to read the twist messages and display them over the serial port. The reason why I am using 9600 baud instead of the default I am using an hc-05 bt module wich supports 9600 baud. I am unshure whether this is ros related or if i missed something here.

XGBC edit: I have now figured out how to change the modules baudrate and now it works but it is still a weird issue