add more ram
Turn the graphix down or get a better computer.
Try servers that aren't as busy. Or try a different computer if possible.
it is probably lagging because your in a populated placeor your computer is slow and have virus
Turn every graphic quality to low and make sure all programs using RAM are closed.
Compare the specifications needed to run DC Universe Online at an acceptable level with the specification of your computer. I'm willing to bet you have a very old computer, that simply is not good enough.
Its something called "Lagging". Lagging is when your computer or Habbo is slow and still needs loading up.
you might have to make the graphic quality lower. check if you computer meets the syste requirements, because if it doesn't then it can cause some serious lag.
Get Game Booster 3.
To get DeSmuME to stop lagging, go to Configuration, then Frameskip. Set the frameskip to 9, and limit the frame rate. That should get DeSmuME to a speed where it almost never lags, and never goes too fast.
Your computer must be lagging or malfunctioning.
Usually you would clean out unessary files, and programs which would make it alot faster. It may seem like it won't work but trust me it does. Hope this helps :)