Hi all, I'm currently still running Snow Leopard on my 2008 Mac Pro (2x2.8Ghz, 14Gb RAM, all HDD's, AMD HD5770) and want to upgrade my OS X to something newer (mostly because of compatibility with Lightroom 5). I'm a bit worried that stuff will slow down when I upgrade to Lion or Mountain Lion. The OS is currently running like a charm (I know, all things are relative.. ). I mainly use my MP for photo editing and the occasional time lapse creation. Safe to upgrade to Mountain Lion? Or will I notice significant speed drops Safari wise, loading programs etc.? Thanks a lot!