I bought a 50 inch lcd Sanyo, I got a few questions?

1. I notice that the picture quality isn't as good as my 32 inch lcd. Is their any way to get a better quality, like maybe change the screen size somehow or something? I don't have the remote yet so i don't know, It just seems like its stretching the picture a little to much

2. I use it for playing video games (mostly Halo) I've noticed that the is a slight delay in the reaction time between what I push on my controller and the t.v. Is there anyway to fix this cause that is really annoying.

The television is 2009, Sanyo LCD