There are many reasons why your garage door may be moving slower than usual. If your garage door springs and cables are worn-out, they will have a harder time lifting your garage door, which will cause your door to open slower. Another reason why your garage door may be opening slower is the garage door opener. If your opener needs repairs, then it will slow down your garage door while in motion. If your garage door is slower than usual, then we suggest scheduling a garage door repair with a trained professional.