I understand that you've been experiencing significant performance issues, unresponsiveness, and crashes while using Illustrator 2023. We understand how frustrating these issues are. We have consolidated the most popular solutions that help fix these issues. Please check this help article for more details (https://adobe.ly/3cRKo0N).
Also, ensure the GPU performance is enabled in Ai preferences and try optimising the GPU performance in your System settings as shown in this YouTube video (https://youtu.be/AlX1vB7ItJc?t=1784)