readme: add benchmark details

Author: krichprollsch

README.md

@@ -28,6 +28,7 @@ Fast web automation for AI agents, LLM training, scraping and testing:
 
 [![](https://cdn.lightpanda.io/assets/images/benchmark_2025-02-19.png)](https://github.com/lightpanda-io/demo)
 
+Puppeteer requesting 100 pages from a local website on a AWS EC2 m5.large instance.
 See [benchmark details](https://github.com/lightpanda-io/demo).
 
 ## Quick start