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.
Property name | Description |
---|---|
resourceType |
Types of resources. Possible values are “script”, “link”, “img”, “xmlhttprequest”, “iframe”. |
name |
The resource’s loading URL. |
duration |
Time used for the entire request/response cycle. Measured in milliseconds. |
transferSize |
Size of resource. Measured in octets (or bytes (9-bits)). This value might be missing in some browsers. |
Example
{ type: 17, offset: 7570, screenviewOffset: 1, count: 11, fromWeb: true, performanceAlert: [{ resourceType: "img", name: "http://someUrl/res/100.jpg", duration: 982.9999995417893, transferSize: 5833734 }, { resourceType: "script", name: "http://someUrl/js/someJs.min.js", duration: 4022.5000004284084, transferSize: 941911 }] } note: "transferSize" may be missing in certain browser
Note:The “transferSize” in the message is only available in Chrome 54+,Firefox 45+, and Opera 41+.