Do you still have to plug your pc power chord into a wall socket to charge and not run on battery?

I'm using on a 256x1600 and it's so laggy that it's unbearable. I wouldn't recommend it. It's almost annoying enough that I'm thinking of ditching the 32 inch monitor to get rid of the lag.

I've been using the dock for 7 months and have intermittent problems (can't connect, dropped connections, poor performance), including system lockup, where I have to do a power down/up. Fortunately, most applications now have document recovery, so I seldom lose much work, but it is a nuisance at best (I did have a file corrupted once which was fairly painful). It recently started failing to connect for long periods of time and it now looks like I need to get a replacement dock. I would not recommend the docking station to others, it's just not ready for prime time. I am unfortunately stuck with mine since my Dell Latitude 6430u doesn't have a physical docking connection. If the problems persist, I will just have to learn to live without "docking" - woe is me. :)

Are higher resolutions possible over Displayport, such as 2560x1600 (1440)? If yes, are two screens with that resolution possible over Displayport?