我正在尝试运行无头Xvfb服务器来捕获Amazon EC2 micro上的屏幕截图。但它正陷入GLX。我使用这个脚本安装了GLX，Xvfb和所有库：https://gist.github.com/joekiller/4144838
DISPLAY=:1 firefox http://www.google.com &
这是控制台输出
Xvfb :77 -screen 0 1024x768x24&
[7] 29462
[ec2-user$ Initializing built-in extension Generic Event Extension
Initializing built-in extension SHAPE
Initializing built-in extension MIT-SHM
Initializing built-in extension XInputExtension
Initializing built-in extension XTEST
Initializing built-in extension BIG-REQUESTS
Initializing built-in extension SYNC
Initializing built-in extension XKEYBOARD
Initializing built-in extension XC-MISC
Initializing built-in extension SECURITY
Initializing built-in extension XINERAMA
Initializing built-in extension XFIXES
Initializing built-in extension RENDER
Initializing built-in extension RANDR
Initializing built-in extension COMPOSITE
Initializing built-in extension DAMAGE
Initializing built-in extension MIT-SCREEN-SAVER
Initializing built-in extension DOUBLE-BUFFER
Initializing built-in extension RECORD
Initializing built-in extension DPMS
Initializing built-in extension Present
Initializing built-in extension X-Resource
Initializing built-in extension XVideo
Initializing built-in extension XVideo-MotionCompensation
Initializing built-in extension SELinux
Initializing built-in extension GLX
如何解决？ xvfb在ec2中这么慢是常见的吗？