@Sybeiria - I'm afraid your system is underpowered to be running TS3 and all 11 EPs (the Stuff Packs don't really add any measurable overhead). First issue is that with only 4 GB of RAM total, there won't be enough RAM to to service the game after Windows grabs what it and other system related processes require and I'm assuming here you are on Win 10 or 8.1 by now. The game does not react well to lack of RAM, it is not stable when it needs to use virtual memory, and there will always be limits as to how far you can bring worlds and how long play sessions can really last before trouble starts or the game crashes/cannot be saved.
The second is that with integrated Intel graphics, the heaviest of the EPs would likely be out of the question as they practically require a dedicated graphics card of sufficient strength to preserve performance. Those are, in order, Pets, Seasons, IP, and ITF. Some of the others would be kind of in between on their impact.
The third issue is that your processor probably isn't strong enough to carry the heavier EPs either in a smooth manner but that becomes kind of moot because of the lack of a dedicated graphics card.
That's not to say you can't play TS3 at all on that laptop as long as you have a way to keep it ventilated and cool (a cooling pad might help). But realistically we would be talking about the base game and maybe a few of the earliest released EPs up through perhaps Generations, on no more than low to medium graphics settings in Game Options, and restricted to worlds that we know are gentler to play than others such as Sunset Valley, Riverview, and Twinbrook. Is this really the strongest computer within reach to play the game right now?
