In 0.54, the street lights in the city of Agia Marina look a little dim, but there is no performance dip when I view them at night.
In 0.55, a screen shot in the exact same location, exact same time in-game, exact same settings, I receive 40 frames per second LESS.
I realize it's alpha, and I'm not trying to rush development or anything, I doubt someone from Bis will even see this. Just asking the community if they think there will be a hotfix soon and if this is a common occurrence for anyone else.