在PHP中加载/包含许多文件是否更快？

I have about a 2000 line functions file, and I have realized I can split it up into a bout 4 files, and only include the one's required. At the moment it is very neat, and ideally I would like to leave it that way, however if speed increases can be gained I would like to only include the different sections on particular conditions.I have about a 2000 line functions file, and I