Performance API
Pylenium's custom performance API to capture different metrics.
Last updated
Pylenium's custom performance API to capture different metrics.
Last updated
The Performance class is where everything lives. It provides access to the following methods:
The main method used to generate a WebPerformance object from the current web page. This is really all you need from this API and will be discussed in more detail .
Calling this method too soon may yield NoneTypes because the browser hasn't generated them yet.
Return the timeOrigin precision value. This is the high-resolution timestamp of the start time of the performance measurement.
Return the PerformanceNavigationTiming W3 object as a Python object called NavigationTiming.
Return the PerformancePaintTiming object as a Python object called PaintTiming.
Return a list of PerformanceResourceTiming objects as Python objects called [ResourceTiming].
All of the timing objects include A LOT of data points, but many of them may not be useful.
This is why the WebPerformance object exists! It contains calculations for metrics that have been very useful when we talk about and measure web performance. After navigating to a website and capturing these metrics with py.performance.get(), we can do whatever we want with them!
With a few lines of code, you have access to many valuable metrics:
The time it takes for the page to load as experienced by the user.
The time it takes before the first byte of response is received from the server.
The time it takes for the majority of content to be fully rendered and consumable by the user.
The time it takes for the layout to be stabilized and the page is responsive.
The number of requests sent from start of navigation until end of page load.
The time it takes for the DOM content to load.
The amount of bytes transferred for the page to be loaded.
The time taken to connect to the server.
The time taken to send a request to the server and receive the response.
The time to complete the document fetch (including accessing any caches, etc.).
Store the entire WebPerformance object in a variable, then convert it to a Dictionary to log it.
Store a single data point in a variable and test against it.
If you want to see ALL the data points, take a look at