Generally speaking, if you want to leave your job and jump ship, you don't need a job performance certificate from the company, because generally speaking, no company will issue this certificate to the employees who have left, so you should mainly prepare a resume yourself. For example, some things that you have overfulfilled in the company are best quantified by data. On the whole, you are knowledgeable. Well, the interviewer should know whether this is true or not.

However, if you can have the work certificate of your company, you may go further in your own field, and the general company will not open it. I think it's safer to find your own supervisor and ask him if he can write himself a, er, work performance or a letter of recommendation, which is actually more credible.