fps decreases to 60 since the 1.18 update

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Thank you for your report!
However, this issue is Incomplete.

Your report does not contain enough information. As such, we're unable to understand or reproduce the problem.

You are welcome to create a new ticket about your issue with more detailed information.
However, please review the Bug Tracker Guidelines and be sure to search for existing issues before writing a new bug report.

Quick Links:
📓 Bug Tracker Guidelines – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki

Seems like you have vsync on (which is by default)

I have a monitor that goes to 75fps as well but Windows makes it 60 instead. Go to settings > Display > Advanced Display and change where it says 60 Hz to 75 Hz.