I have solved both issues and I am writing this for anyone who will have the same symptoms.
For the speed problem I have checked every cable, solder, connection and everything seemd O.K. I began to suspect that i damaged my chip so I ordered a new ATmega 328p and burned a new bootloader. SUCCESS!! The speed problem was gone but the lagging LCD remained. I found out later that lagging was caused by my modified source code, because when I loaded the original this problem was gone to.
I am happy to say my MPGUINO is up and running! Maybe I will post some pictures later.
Best regards,
Kristian
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