When i say not fully working, i mean i have lag spikes every minute. It occurs a lot when i am building coasters and pools. Its livable when browsing and watching over my park, but when you're trying to build a masterpiece it really is annoying.

What kind of graphics system do you have? Chances are if you use one of those built in intel graphics accelerators, RCT3 will overwork it.

ok heres a fix i need the specs on your pc ..then if its an ok pc or better ill tell you what settings in your graphics tab to set as whatP