The requirements for this game are as follow taken from the official website :
Operating System: Windows 98SE / Me / 2000 / XP [XP recommended]
Processor: Pentium III,
700 MHz [Pentinum 4, 1.4GHz or above recommended]
Graphics Card: Direct3D compatible, 3D graphics board, minimum 32 MB VRAM
Supported Cards: NVIDIA:GeForce 3/3Ti200/3Ti500, 4Ti4200,FX5200/5600/5900
ATI: RADEON 8500/8500LE/9600PRO/9800PRO
Sound Card: DirectSound compatible
DirectX: DirectX 9.0b or above
Internet Connection Speed: 256kbps
I doubt there's a computer out there that would have issues running this unless it's 15~20 years old or something. I used to play on an old 1.4ghz celeron about 10 years ago and never had any lag (On max settings with gameguard on). If you do happen to lag, most likely it has to do with a software running on your system and not the game itself. Even the older 500mhz Intel computer I was using would probably have been fine if it wasn't capped with an integrated 4MB VRAM lol What's important is to make sure no other process is draining your cpu if you only have a single core because the game will use 100% cpu (Namely antivirus or lots of background tabs in your favorite browser, etc.).