【性能调优】字符串拼接：table.concat替代连乘的实测收益

local function benchConcat(list)
    local t0 = os.clock()
    local s = ""
    for i = 1, #list do
        s = s .. list[i] .. ";"
    end
    return (os.clock() - t0) * 1000
end
local function benchJoin(list)
    local t0 = os.clock()
    local s = table.concat(list, ";")
    return (os.clock() - t0) * 1000
end

local lines = {}
local function addLine(text)
    lines[#lines + 1] = text
end
local function dumpReport()
    local body = table.concat(lines, "\n")
    lines = {}
    return body
end