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I upgraded from ATI Radeon HD 5670 256MB VRAM (or whatsoever) to ATI Radeon HD 6450 2GB VRAM. When I was booting my PC it seemed quite slow. I began to panic when I saw 256 MB in PCI devices listed in 'hardinfo'.

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I take you haven't installed the propietary drivers? does hwinfo shows the same? – Uri Herrera Sep 26 '11 at 14:37
Maybe it's a faulty card.. does other OS shows the same behavior ?. – Uri Herrera Sep 27 '11 at 3:49

Just go to the CCSM (Config Compiz Settings Manager) OpenGL-> Uncheck "Sych with VBlank"

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