bug#21028: Slow font rendering in emacs

[Ralf Jung]

Hi again,

> On a high level, what I want to achieve is for things to look like they
> do in Kate/gedit. ;)

I should add that actually, on an even more higher level, I want things
to look "properly monospaced", with all characters (or as many as
possible) being aligned in the grid.  I bring up Kate/gedit because they
demonstrate that this is actually possible without any configuration
being required by the user.  It would be of course fine if Emacs looked
different, as long as it looked "better" (whatever that means ;) and,
most importantly, managed to maintain the grid wherever possible.

; Ralf