The biggest improvement you can make to a traditional (read off) Mac or Windows computer is to upgrade to an SSD. With OWC's internal SSD kit, you can add an SSD to a standard hard drive and still keep the DVD drive. Boot from the SSD and it's like a new computer. The facility is not for the faint of heart. Feasible with the right tools and workspace, but my local Apple dealer did the installation for a reasonable fee.
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