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cirrus vga is very slow in qemu-kvm-0.12
As has been reported multiple times (*), there were a regression in qemu-kvm from 0.11 to 0.12, which causes significant slowdown in cirrus vga emulation. For windows guests, where "standard VGA" driver works reasonable well, -vga std is a good workaround. But for e.g. linux guests, where vesa driver is painfully slow by its own, that's not a solution.
(*)
debian qemu-kvm bug report #574988: http://bugs.debian.org/574988#17
debian qemu bugreport (might be related): http://bugs.debian.org/575720
kvm mailinglist thread: http://<email address hidden>/msg33459.html
another kvm ml thread: http://<email address hidden>/msg32744.html
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