Why does Roblox studio start stuttering, then crashing if a too high value is entered?

So today i was working on a terrain generator with math.noise, wich actualy works perfectly.

The only issues I currently have is when a too high "Seed" is entered:

1. The terrain generator will not generate anything.

2. Roblox studio starts stuttering the fps (60, 5, 1, 30, 5, 60, 3 etc.),

3. Eventualy Roblox studio completely freezes.

If anyone has any idea on why this could happen, please let me know.

(I've figured out it starts doing point 1,2 and 3 if the value is higher then the maximum 32 Bit Int value, but Negative value Seeds are possible too. (-3000 works just fine))

Here's the code, may anyone have any information on why this occurs, please let me know. Thank you.

Link to place to try it out

local ChunkSize = 20
local running = false
script.Parent.Event.OnServerEvent:Connect(function(player,Seed)

    if not Seed then return nil end

    if running then return nil end

    running = true

    for _,v in pairs(game.Workspace.Model:GetChildren()) do
        v:Destroy()
        game["Run Service"].Heartbeat:wait()
    end

    for a=0,5 do
    for b=0,5 do

        local Model = Instance.new("Model",game.Workspace.Model)
        game["Run Service"].Heartbeat:wait()
        game["Run Service"].Heartbeat:wait()
        game["Run Service"].Heartbeat:wait()

        for BLAX=1,ChunkSize*2,1 do 
        for BLAY=1,ChunkSize*2,1 do

            local X = BLAX  /2
            local Y = BLAY  /2
            local Z = Y
            local Y = (1 + math.noise((a*ChunkSize+X)/30,(b*ChunkSize+Y)/30,Seed)/2)

            local p =Instance.new("Part",Model)
            p.Anchored = true
            p.Size = Vector3.new(.5,.5,.5)
            p.BrickColor = BrickColor.Green()
            p.Material = Enum.Material.Grass

            p.CFrame = CFrame.new(a*ChunkSize+X,Y*20,b*ChunkSize+Z)

            if Y* 10 < 9.2 then
                p.BrickColor = BrickColor.new("Br. yellowish green")
            end

            if Y*10 < 8.7 then
                p.Material = Enum.Material.Sand
                p.BrickColor = BrickColor.new("Cool yellow")
            end

        end
        end
    end
    end
    running = false
end)

EDIT: I know that I can easily solve this by checking if the number is higher then, lets say 1e45, but thats not what i'm going for. I wan't to find out why this happens.