It can be because you are on a crowded server, or if there are a lot of people on at the time. You can try logging off then coming back on, or coming back later and seeing how it is. You may also have a slower computer and a old graphic chip...may need to upgrade your computer. Hope this helps you out.
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Lag spikes can be caused by alot of different things and video cards are just one of them. They can also be caused by having a ton of people in the same area (like Dalaran, Org, or Stormwind or raids), or having a bad connection between WoW and your ISP (Internet service provider). Video cards can help with the lag as well as having the best internet connection you can afford.
No, you can not buy my world of warcraft account, i have put too much time and money into it.
Yes, you use your Battle.net account to log into World of Warcraft.
World of Warcraft is listed as compatible with Windows 7, and should work fine.
You can download the game client from the link below. It is the official world of warcraft site.