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Changing the Renpy graphic acceleration option fixed my issue. (Forcing DirectX, tested on Windows/Intel Graphics).

You can check the renpy documentation: https://www.renpy.org/doc/html/problems.html.

Have you solved this problem? When I solve the first math problem, the program lags and if I click or press enter, the screen goes totally white, and window pops up which says the program isn't responding.

I ran the game with an administrator option.