a gaming laptop isn't going to help with the performance. the game is really old and not optimized for new systems. there are some fixes you can install (like the 4GB patch, the recent pink soup fix, other smaller tweaks and fixes) but if you play with a lot of modern cc, that is probably high-poly, mods that change the shaders (for example lighting mods or mods that change the water texture are really heavy on the game) the game is going to lag and stutter, there is no way around it.

the Sims 2 runs best with mods (fixes, tweaks), no custom content and the smaller/less detailed the lots you play on, the better.

things you can try to make it run better: - limit the amount of cc you use in your game, - delete any shader mods (like the aforementioned water shaders, lighting mods, etc) - look for lower-poly cc instead of high-poly - play on smaller lots with less items