There are some bugs in the code that make the site load very slow. Hence those bugs have to be fixed and also various optimization that could be done to speed up the site have to performed which includes MySQL too.
The important thing here is we need to see your working style and due to security reasons, the freelancer or an employee from a company got to use team viewer and work remotely on the client system.
Hence type the word 'TEAM VIEWER' has to be there on your bid description for you to be even considered for this job. The work is urgent so the hiring will be immediate.
Good luck and smart work!