There have been some great explorations into this topic before but mostly centered around number of requests, total bytes, etc and correlating to performance, so I poked around for some direct answers about execution time. I’m excited about this start and the possibility to dive deeper into individual scripts, libraries, etc in the future!
Detailed queries and reports with third-party rankings are over in https://github.com/patrickhulce/third-party-web, but here are some highlights:
- Ads are the biggest chunk of third-party execution at ~23%.
Breakdown of 3rd Party Execution by Category
Feedback and contributions welcome! I’ve only identified ~90% of the third-party script execution origins so far, so help wanted on the long tail