If your boss really wanted to improve your performance, he or she would sit down with you and talk to you like a friend or a coach. They'd say, "Something is getting in your way on the job. Let's figure it out! You are awesome and I know we can work through this."
Plans (or PIPs) get a bad rap. And many people equate being put on one with being fired (which is only sometimes true).
To Winpsheng, we really spend lots of time on PIP and the effect is good. Below photo shows our manager is training our sales to improve the sales skills.