Light Rail's average speed south of downtown is roughly 50mph, but once it reaches downtown, it slows to a snail-like crawl of 10-15mph. This is due to the fact that the train must wait for both traffic and pedestrians because it is at street level.
I suggest that the train tracks downtown either be elevated (similar to Chicago's El-train) or tunneled. This type of upgrade would speed up service enormously. If light rail became a speedy way to travel, I would definitely use it more. As it is, I can often take my car or even bicycle and get there more quickly than the light rail can.