First, check the Renpy settings for the lag issue (Shift + G).
Second, hard mode's hard on purpose and I don't accept suggestions to make it easier. When you unlock the Heart it takes longer for girls to get angry. Not only that but in each version, I'm introducing an engagement item that makes the girls never get angry so this will end up making the hard a lot easier.
If you don't like the mood system you can talk to Lisapi and change the mode (Easy/Normal) 😅