A suggestion from the HHS BK forum may help. They say some lags on girl screen may result from the renderer switching between two options.Edit: After a proper reinstall, its working much better than my previous attempt at updating, but a smidge worse than the version in OP performance-wise. I'm gonna try tweaking some of the image cache settings and seeing where that lands me. Thank you for the help Doug.
The poster recommends using the Graphics Acceleration menu, from holding down Shift while starting Ren'Py, or press Shift+G once Ren'Py has started. Then select GL2 renderer (not default "Auto"), and disable Powersave.
Choose Return if you need to save the game before exiting game, else Quit will end game. Then run game again.
If you want to experiment with Angle2 (Windows DirectX), you could try forcing that instead, and compare results.
As the screen says, changes take effect next time you run Ren'Py (run the game).
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