While looping a for loop lags player?

Heres the script:

--Example

local function getProp(obj, prop)
    local getPropVar = obj[prop]
    return getPropVar
end

while wait() do
    for i,v in next, game:GetDescendants() do
        local Transparency = pcall(function() getProp(v, "Tranparency") end) --The part that lags (from what im thinking)

        if Transparency then
            Tranparency = 1
        end
    end
end

Its pretty simple. Incase if you dont understand, its supposed to get every object in game and then check if the object has Transparency property. And if it does, it sets it to 1. So the problem is pcall(from what im guessing) since it lags the server. Ive tried adding a wait() to the for loop. it works but it makes the loop really really slow cause of pcall. It cuts it and then plays it back after a few seconds and then cuts it again.

Is there any fix to this?