Make gvim faster or get terminal vim to work with colours and,alt-keys

Hi, I noticed that gvim has a bit of a slow down every time it opens a
completion menu when the file is reasonably big (about half a second for
a ~400 line python source file), and it's also slow when going up/down
in the menu and closing it. I'm using vim 7.3 on Ubuntu with gtk+2. Is
there any way to make it faster?

Alternatively, maybe it's easier to get things working right in the
terminal vim. I need to use 256 colours and alt-key shortcuts. The
closest I've got is using xterm with CSApprox plugin, the only issue is
that alt-1 to 9 keys don't work and, more importantly, when I switch
buffers, background changes to white. Setting an autocommand to set
colorscheme on BufEnter doesn't work for some reason.

Thanks! -ak

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