I'm playing on my girlfriends computer (Mac) and randomly my ping will spike too 800+ and I'll lag out for a few seconds before coming back to being able to actually play again. This happens about once a minute or so, give or take. I've tried opening the ports on both the Mac's firewall as well as our router and have also done multiple power cycles and nothing has helped so far. The Mac OSX is up to date. All the video settings are at the lowest possible.

Diablo 3 is the only game that this happens with. Starcraft 2 runs fine, Hearthstone is fine, multiple games on my Steam account are fine. Diablo 3 is the only game that seems to have lag spikes for me. There's also lag spikes for this game in particular with my roommates computer as well (Windows 7), so we think it has something to do with our ISP or our router's settings when trying to connect to the Diablo 3 servers.

Mac OSX version:
    OS X 10.9.2 (13C64)

Hardware specs:
    Model Name: MacBook Pro
    Model Identifier: MacBookPro8,1
    Processor Name: Intel Core i5
    Processor Speed: 2.4 GHz
    Number of Processors: 1
    Total Number of Cores: 2
    L2 Cache (per Core): 256 KB
    L3 Cache: 3 MB
    Memory: 4 GB

Router/Modem:
    Cisco Model DPC3825

ISP:
    Cox Cable
Edited by Oogzy#1753 on 4/22/2014 6:21 PM PDT