The old rule of thumb for when I wanted a cheap upgrade of performance was to install additional RAM because this increased the amount stored in fast memory and reduced usage of the slower HDD. Now SSD is comparable with RAM speed we have more choice for improving performance. But there is always a but. SSD is still expensive so storing all your MP3s, pictures and videos could hurt my wallet. But there is another way thanks to a piece on lifehacker Podcast: Install a small super quick SSD into the laptop for OS and apps and keep HDD in CD bay for multimedia.