2017 macbook pro. GhZ dual core i5. 8 Gb RAM. I am incredibly frustrated. Big Sur turned my computer into a brick compared to performance on catalina. I've been using a windows xp old comp that I have at work. It takes sometimes 10-15 seconds for finder to open. My slowdowns are system-wide. From browsers to messages. My god messages... Sometimes takes 20 seconds to open messages. I can't work like this. Please fix. I expected a windows PC to last 2-3 years and a Mac to last 5-7 years. Please fix this has been a nightmare.