238 THE OFFICIAL RASPBERRY PI BEGINNER'S GUIDE
n Overclock: Allows you to choose from a range of settings that increase the performance
of the Raspberry Pi at the cost of increased power usage, heat generation, and possible
decreased overall lifespan. Not available on all models of Raspberry Pi.n GPU Memory: Allows you to set the amount of memory reserved for use by the Raspberry
Pi’s graphics processor. Values higher than 128MB (the default) may improve performance for
complicated 3D rendering and general-purpose GPU (GPGPU) tasks at the cost of reducing the
memory available to Raspbian; values lower may improve performance for memory-intensive
tasks at the cost of making 3D rendering, camera, and selected video playback features
perform more slowly or become unavailable.Localisation tab
The Localisation tab holds settings which control which region the Raspberry Pi is designed to
operate in, including keyboard layout settings.n Locale: Allows you to choose your locale, a system setting which includes language,
country, and character set. Please note that changing the language here will only change the
displayed language in applications for which a translation is available.n Timezone: Allows you to choose your regional time zone, selecting an area of the world
followed by the closest city. If your Raspberry Pi is connected to the network but the clock is
showing the wrong time, it’s usually caused by the wrong time zone being selected.