Performance Alert message (Type 17) message
Performance Alert messages let you monitor slow-performing client-side static content, such as CSS, JS, and images. They are Type 17 messages.
||Types of resources. Possible values are “script”, “link”, “img”, “xmlhttprequest”, “iframe”.|
||The resource’s loading URL.|
||Time used for the entire request/response cycle. Measured in milliseconds.|
||Size of resource. Measured in octets (or bytes (9-bits)). This value might be missing in some browsers.|
Note:The “transferSize” in the message is only available in Chrome 54+,Firefox 45+, and Opera 41+.