BWL; Why am I lagging?

As the title says I lag doing BwD 25 man. Why? I did Nefarian last week with my guild since they did all bosses and saved Nefarian.

I was lagging too while doing Nefarian but not dramatically.

Do all the lag have to do with 4.1?

I swear that I did BwD fine before 4.1. ;P

I have lowered my things on my interface and it still doesnt work. I lag a lot anyways when I enter combat.

Updated your addons?

FAIL (the browser should render some flash content, not this).

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