Sorry to hear that you’re seeing an error message at the top of your dashboard and that it’s affecting your site performance. Yes, it is possible that you have corrupted files. The first you can do is to run a check on your WordPress database files. If you need help with that I would recommend contacting your host’s support team. If the problem persists then I recommend that you ask your host’s technical support to help you pinpoint the cause of the performance problem.
If you have any further questions or comments, please let us know.