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Do not use a task killer, a waste
I think everyone's Behold 2 lags a lot.
Fortunately there are ways to help the lagging. Make sure you don't have many apps running at the same time. You can view how many apps are currently running by downloading an application task manager from the Market. The same app should help you terminate some of those.
What are you currently running? Stock, galaxy....? Any home replacements? Widgets? I'd recommend you reading some on this forum. It's full of tips and advices.