The minimum requirements for RuneScape HD are:
256MB RAM, 1.5GHz CPU, 64-megabyte 3D Graphics card, such as Nvidia® GeForce™ 3 or above CPU and RAM would be no problem for most laptops, so try looking for a laptop with some real graphics components.
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This depends on your system specifications; if it doesn't meet the requirements, then no. If it meets the requirements or exceeds them, then it should.
Yes. As long as your computer meets the requirements for running Roblox, it should be able to run Roblox.
There is an old movie from 1914 that meets your requirements "Unjustly Accused"
you might have to make the graphic quality lower. check if you computer meets the syste requirements, because if it doesn't then it can cause some serious lag.
that sounds like a big problem, i would try reinstalling your game, and checking if your computer meets the system requirements for the game to work properly.