Budget: 1000 UAH Deadline: 2 days
Good day.
Most likely, updating WooCommerce will solve your problem.
I recommend making a backup, updating WordPress, WooCommerce, other plugins, and checking the result. It may also be possible to update Apache with MySQL if there is such an opportunity.
If slow queries remain, look at how to optimize them.
I would be happy to help speed up the website. Feel free to reach out.