gistfile1.txt

local requestTime = {}

local frame = _G.TestGetItemInfo or CreateFrame("Frame", "TestGetItemInfo")
frame:RegisterEvent("GET_ITEM_INFO_RECEIVED")
frame:SetScript("OnEvent", function(self, event, id)
      if requestTime[id] then
         print(format("%d", (GetTime()-requestTime[id])*1000) .. " ms", "   ", id) --Time between request and receive" 
      end
      
end)

local function TestGetItemInfo()
   local id = 0
   while not GetItemInfoInstant(id) do
      id = math.random(1, 200000)
   end
   requestTime[id] = GetTime()
   GetItemInfo(id)
   C_Timer.After(1, TestGetItemInfo) -- Repeat every 1s
end
TestGetItemInfo()