We added a turn off Live2D animations option in v1.0.5! I hope this update will fix your performance issue.
Viewing post in Distant Oceanic Getaway comments
Hello thanks for the update :D it's a little laggy when a character pop up on screen (main characters or not) when characters' expressions change, or when they slide to make more space for a new character
Sorry I took so long to answer and for any misspellings (I'm using a translator) I'm on windows 7, also, you were quick with the update O.O *clap clap*