Input lag calculator

main.py

#!/usr/bin/env python3
import gi
import time

gi.require_version("Gtk", "3.0")
from gi.repository import Gtk, GLib

cur = int(time.time()*10**6)

diff_min = 10**6

label = Gtk.Label()

def event_handler(*args):
    global cur, diff_min
    diff = (int(time.time()*10**6) - cur)
    cur = int(time.time()*10**6)
    if diff < diff_min:
        diff_min = diff
        label.set_text("{} µs".format(diff_min))

win = Gtk.Window()
win.connect("event", event_handler)
win.connect("touch-event", event_handler)

win.set_size_request(400,400)

win.connect("destroy", Gtk.main_quit);
win.add(label)
win.show_all()
Gtk.main()