Hi Richard,
sorry for the late reply.
Do you use the HTML version of the game? If that is the case then you could try out another browser (i.e. Chrome or Firefox).
Another possibility is to use the native Windows version of the game.
If you already use the native Windows version then you could check if the driver for your graphics card is up to date. Or at least as new as possible. Sometimes it is useful to download the driver from the manufacturers site instead of using the default driver installed by windows. I know that this isn't always easy. Especially on older notebooks.