The invention provides a method for improving browser starting performance. The method comprises the steps of based on a thermal migration mechanism of a container, shortening starting time for restarting a browser on a computer, wherein in the starting process of the browser, when a browser progress builds communication with all rendering progresses, the thermal migration mechanism of the container is triggered, and the states of all the containers in the progress are stored into state files; storing the state files; when the computer needs to restart the browser, according to the state files, recovering the executing state of the container to wait for loading a uniform resource locator (URL) specified by a user. The starting performance of the browser is improved, and the starting time for restarting the browser on the computer is shortened.