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+.