Batch rendering, scan line rendering in a slightly larger point in the scene is very slow! There are a lot of angle need a piece of rendering, batch rendering is very convenient, but why will be very slow? Separate rendering (shift+q) is very fast, 2 minutes at most one, but the batch rendering rendering a more than 10 minutes a piece, what reason is this excuse me? Before using the max9 when this is not the case, since the max2012 version is this! Ask what is the reason? Thank you!