A method of measuring load time for a web page includes video recording a duration of the web page load including capturing N frames in a series of frames 1 through N of the web page. The method includes comparing each frame from frame 1 through frame N−1 with a next frame from frame 2 through frame N in the series of frames to determine a pixel change amount between the compared frames. The method includes defining a series of page phases for the duration of the web page load, each page phase defined by a start time and an end time with each phase start time determined based on estimating user perceptible pixel change amount levels.