Hi @iida_wp,
Thanks for taking the time to share your thoughts on the plugin, and sorry to hear you don’t feel like using it. With regards performance, we’ve added details to the plugin website to help users understand how the plugin works with regards performance, and the impact or tradeoff with the service you choose to connect using Site Kit. You’ll find this below:
https://sitekit.withgoogle.com/documentation/using-site-kit/front-end/
If you’re willing to give the plugin another try, I’d be happy to work with you to help troubleshoot any issues you may have? In order to do so let me know what services you connected, or any details of the troubleshooting you’ve performed.