I also saw that your FPS is at 30. Change it to 60 and try this code for starters:
local smiley = display.newImage("testimg.png") local speed = 2 local moveSmiley = function(event) smiley.x = smiley.x - speed if smiley.x \< 0 then smiley.x = 300 end end -- moveSmiley Runtime:addEventListener("enterFrame", moveSmiley)