|OK, here's your laptop specs: http://www.toshiba.co.uk/discontinu...|
It has Intel GMA 4500MHD graphics. There is NO dedicated graphics memory, the memory is 100% shared. There may be a setting in the BIOS for the amount of initially shared memory (32MB, 64MB, 128MB, etc) but the rest is dynamically shared on an as-needed basis. From the following review: "the performance is just on par with the entry level dedicated graphics cards and therefore not suited for demanding games".
There's nothing you can do to improve it's performance. Stick to older games at low settings.