Title: the relationship between framebuffer and starting speed----a newbie question

I'm sorry that my english is not good

I want to make Xserver start more fast.
And I study the code in  dix/main.c,and reduce some code in Keyboard and Mouse initialization.I find that it takes only 0.5 second from the start of main.c to the dispatch() function(dix/main.c).

But when I  type in XFree86,It  seems  that from the the typing-XFree86 to the bitmap  comes out on screen takes me 2~3 second.

I think that most time is spent in from RAM to Screen.

Someone tell me that KDrive(because using framebuffer) can make starting more faster.I try KDrive,and the bitmap comes out on screen as soon as I type in Xfbdev.

But I also hear that framebuffer doesn't support acclerration and it doesn't work if I play DVD. In fact I don't know the exact meaning of framebuffer.

I have little knowledge in display.Now I am studying related source code and docs.

Can you explain to  me,the relationship between framebuffer and starting speed ,and If framebuffer can support accleration.


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