Caching Instances

local cache = {}

--[[
    cache = {
        className = {
            instance1,
            instance2

            ...
        }
    }
]]

-- instance.new
function getInstance(className, parent)
    local ins

    if cache[className]then
        ins = cache[className][1]
        if ins then
            table.remove(cache[className],1)
        end
    else
        cache[className] = {}
    end

    if not ins then
        ins = Instance.new(className)
    end

    if parent then
        ins.Parent = parent
    end

    return ins
end

-- destroy
function cacheInstance(ins)
    local className = ins.ClassName

    cache[className] = cache[className] or {}

    table.insert(cache[className])

    ins.Parent = nil
end