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/Peo, FreeWebSpace.net
depends on what it is for. A fair amount of them are proprietary and will only be used for things like an internal wireless module, modem module, tv tuner, or whatever the manufacturer designs it for.
For a list of what can actually go there give the manufacturer a call or check out the manual it should reveal your options.
And mostly all devices for the expansion slots won't boost your laptops performance... (unless you talk about expanding memory)
What 'performance boost' are you talking about ? (CPU? RAM? HDD? LAN? etc.)