local testGui = Instance.new("ScreenGui", game.Players.LocalPlayer.PlayerGui)
local testLabel = Instance.new("TextLabel", testGui)
testLabel.Position = UDim2.new(1,0,1,0)
testLabel.Transparency = 1
testLabel.TextWrapped = true

local cache = {} --cache table is as follows: cache -> font -> fontSize -> frameSize -> text
for _,font in next,Enum.Font:GetEnumItems() do
    local c = {}
    for _,fontSize in next,Enum.FontSize:GetEnumItems() do
        c[fontSize] = {}
    end
    cache[font] = c
end

local TextService = {}

function TextService:GetTextSize(text, font, fontSize, frameSize)
    frameSize = frameSize or Vector2.new(0,0)
    local frameSizeString = tostring(frameSize)
    cache[font][fontSize][frameSizeString] = cache[font][fontSize][frameSizeString] or {}

    if not cache[font][fontSize][frameSizeString][text] then
        testLabel.Size = UDim2.new(0,frameSize.X,0,frameSize.Y)
        testLabel.Font = font
        testLabel.FontSize = fontSize
        testLabel.Text = text

        cache[font][fontSize][frameSizeString][text] = testLabel.TextBounds
    end

    return cache[font][fontSize][frameSizeString][text]
end

return TextService