local Start = tick()
Array = {}
ArrayN = 0
ArrayLimit = 1200 -- Change this value to improve speed.
PreviousTick = tick()
Previous = 1200
ArrayLimitChange = 50 -- Change this value to change big of an arraylimit change you want
Current = 0


for i = 0, 4000000, 1 do
    if i % 3 == 0 or i % 5 == 0 then
        Array[ArrayN + 1] = i
        ArrayN = ArrayN + 1
    end
    if #Array == ArrayLimit then
        Current = Current + ArrayLimit
        print(table.concat(Array, ";"))
        if (tick() - PreviousTick) > 1 then -- This makes script adapt to your computer Capability.
            if Previous > Current then
                ArrayLimit = ArrayLimit + ArrayLimitChange
            else
                ArrayLimit = ArrayLimit - ArrayLimitChange
            end
            Previous = Current
            Current = 0
            PreviousTick = tick()
        end
        ArrayN = 0
        Array = {}
        wait()
    end
end

print(table.concat(Array, ";"))