@telmarina - If you wish to have a full assessment (of sorts) of how far one should be expected to push TS3 on your current laptop, if you could please provide a dxdiag report by sending it up to
Pastebin.com and supplying a link so we can read it. Different players will have different experiences with the lower to middle range laptops but we can at least provide what the usual expectations should be.
How to run one: https://help.ea.com/en-us/help/pc/how-to-gather-dxdiag-information
So far what we know is that your processor is not the best design for gaming, you have 8 GB of RAM (this is fine). and apparently some sort of Nvidia graphics card in addition to the Intel integrated but we don't know which one. The dxdiag will tell us all of that and more. Regardless, we know from what we can see already that the game will run on this laptop, as you probably know if you are successfully playing it, but all EPs and more than low or medium graphics settings in Game Options, long-running neverending games in larger and highly populated worlds, etc. might be out of the question.
Before we get to the specs question for a new computer, what is your country, realistic budget, and must this new purchase, if there is to be one. be a laptop or are desktops also under consideration.
(I'm admittedly stalling here in part because there are others who hang out on this forum section with a better evolved shopping online gene set than I have)