Suppress the impact of third party code Third party code

At PageSpeed ​​Insights
Suppress the impact of third party code Third party code “Cloudflare” https://ajax.cloudflare.com/cdn-cgi/scripts/cloudflare-static/rocket-loader.min.js
Is the bottleneck.
Cloudflare Transfer size 5 KiB Main thread block time1,861 ms
Please tell me how to improve.

You can try disabling Rocket Loader from the Speed → Optimization page.

Thank you for answering.
Even if I turn off the rocket loader and purge the cache, the advice on the google page still remains.
Is there anything else I can do?

You’re saying that you disabled Rocket Loader, yet PSI still tells you that Rocket Loader is slowing things down? If so, then that means you’re using a third party product that uses Rocket Loader, and you have no control over that…other than not using that product (or getting them to stop using it).