Maybe, JUST maybe a Solution to fix incorrect map info + LAGG!

Ok i found this Program Called Registry Easy.

Download it and put this registry key in "474E-DA87-2C0A-9D9C" (without ")

Heres a link http://www.registryeasy.com/download.php

Once you've done all that run the scan.

Now the scan is finished click Repair, it's going to back up your files cause they love you

Once that is all done it should fix your D/cing and your lag too

Also you should open your ports too!
And disabling your firewall, i don't think thats a great idea.