My computer has become extremely slow after updating to macOS Sequoia 15.7.2.

My PC was fine before updating to macOS Sequoia 15.7.2, and I haven't been able to work in the last two days. The upgrade slowed down my computer, causing issues with my mouse, other apps, and slow startup times. I tried everything, including updating my programs, deleting unnecessary files, and restarting my computer, but nothing worked. I'm beginning to suspect that the software has ruined my iMac. Has anyone encountered this problem, and how did you resolve it? I'd appreciate your recommendations.