Heyy i had the same problem and after so much looking and nobody else had the problem i got frusterrated. My problem was my virus scanning program. If i turn it off the game runs fine, but as soon as the virus scanning program is on it would lag every 5 to 10 seconds like u said and it was realllly annoying. Hopefully thats whats wrong with yours, if you cant turn off your virus scanner try putting it to sleep or disabling it. It could also be a firewall too, but most likely virus scanning. Hopefully that helps ya