--------------------------------------
-- ..
local text
local t = os.clock()
text = ""
for i = 1, 10000 do
	text = text .. tostring(i)
end
print("[1] time: " ,os.clock() - t)

--------------------------------------
-- format
local string_format = string.format
t = os.clock()
text = ""
for i = 1, 10000 do
	text = string_format("%s%s", text, tostring(i))
end
print("[2] time: " ,os.clock() - t)

--------------------------------------
-- concat
local list = {}
local table_insert = table.insert
t = os.clock()
text = ""
for i = 1, 10000 do
	table_insert(list, tostring(i))
end
text = table.concat(list, '')
print("[3] time: " ,os.clock() - t)
os.execute("PAUSE")