Why is Unity stuttering and stopping seconds?

The profiler screen shots you posted on the forum didn't really tell us anything. Tell us more about how this stuttering happens. Does it start-stop-start-stop every few seconds? Is it random? Does it do the same thing on another machine? If you make a new project with just a cube does it do the same thing? Are your graphics drivers up to date?

Yes, it does start and stop every 2-3 seconds, it used to be every 10 or so now it's just constant, I haven't tried it on another PC, but I will soon, yes my nVidia drivers are the latest, I downloaded an update last night, I tried with a project with a cube, it doesn't stutter at all, then I loaded my game again, which reverted to a version that didn't have a water texture in it, and there's nothing wrong with it, okay, now there seems to be nothing wrong with it, but another problem has risen, all my trees look like lods, until I get really up close.

every 2-3 seconds, it used to be every 10 or so now it's just constant

Clean the dust from your fans :P

I literally did that a few days ago, I don't see how that would help :P

Check your heatsinks are seated properly then.

Used to be 10 seconds now constant 2-3 seconds... sounds like your graphics card or cpu overheating.

Low temperature readings are a BAD sign in a computer. It means your heatsinks are not shifting the heat!

I literally did that a few days ago

Did it decrease to 2-3 seconds after this? :)