My score website on gtmetrix is A. When I add facebook pixel code, the scrore is B

Look at this :

[![enter image description here](https://i.stack.imgur.com/dBNuf.png)](https://i.stack.imgur.com/dBNuf.png)

[![enter image description here](https://i.stack.imgur.com/yzsKY.png)](https://i.stack.imgur.com/yzsKY.png)

How can I solve this problem?

I want to add the Facebook pixel code on my website, but I don't want it to reduce the score