GPU is used for viewing only. So when you disable gcode preview that is no speed problem for old laptop. If it is enabled bigger prints can slow down printing due to missing gpu power.
RAM should be always sufficient or you are in trouble. Use Repetier-Server to print and you have no memory problems here. It only needs around 4MB to print regardless of the gcode file size. Host can use for big gcodes considerable more ram then gcode file size. Also server does not depend on gpu, only the browser where you view/control the printer and even there much less then with host.
Slicing always uses cpu so cpu speed affects slicing duration. Ram must be of cours esufficion to hold stl files plus some data structures. The bigger you objects the more ram you need. Just watch task manager and see how ram useage is for your problems.
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