如何提高使用嵌套循环绘制时的性能？

Question

我开发了一个程序，按程序生成一个带迷宫的地牢：

entities = {}
dungeonSize = 8
currentDungeon = (randint(0,dungeonSize-1),randint(0,dungeonSize-1))
lOR = 16 # Level of Randomness.

def gD(): # Generate Dungeon

    for i in range(dungeonSize):
        for j in range(dungeonSize):
            entities[(j,i)] = {}

    for dungeon in entities:
        r = randint(0,lOR)
        for k in range(16):
            for l in range(16):
                if randint(0,lOR*2) == 0:
                    for m in range(r):
                        entities[dungeon][((((l+m)*brickWidth),(k*brickHeight)))] = {"source":"brick.jpg",
                                            "info":["dungeon wall",u"parede da masmorra"]}     
                elif randint(0,lOR*2) == 1:
                    for m in range(r):
                        entities[dungeon][(((l*brickWidth),(k+m)*brickHeight))] = {"source":"brick.jpg",
                                            "info":["dungeon wall",u"parede da masmorra"]}

碰巧我需要在每一帧（每一块地和每一堵墙）绘制当前屏幕/迷宫。在这种情况下，为了节省一些内存，跟踪已更改的磁贴或类似的内容也非常复杂。你知道吗

以下是主循环的绘制过程：

def dCD(): # Draw Current Dungeon

    for wall in entities[currentDungeon]:
        gIS("GFX",entities[currentDungeon][wall]["source"],wall[0],wall[1])

地面也绘制在每一帧（我不能使用一个图像，因为我将创建随机类型的瓷砖）。你知道吗

def fWG(): # Fill with Ground

    for i in range(16):
        for j in range(16):
            gIS("GFX",ground,j*brickWidth,i*brickHeight)

有没有办法在Pygame中“释放一个曲面”，或者无论如何，将所有这些曲面blit并拥有20+FPS？（我现在有8帧。真是太落伍了。如果没有，你有什么建议？用C写游戏，想一个更聪明的算法来神奇地替换，擦除和重新利用每一帧的瓦片？你知道吗