As you can see, our performance is improving. 和 As you can see, our performance is improved. 的差別在哪裡？如果不好說明，請提供一些例句。

In the first, your performance is still in the progress of improving. It has been improving for a little while already, and it should continue to improve.

In the second, did you mean to write “has improved” instead of “is improved”? If you had written “has improved” instead, it would only mean that your performance is better than it was at a previous time, and there is no information about whether or not it will continue to improve any further.

Using “is improved” doesn’t feel right to me, because it is passive. I can see it working in a sentence like “as you can see, our performance is improved by the presence of X”, which means “the presence of X makes our performance better”.