The HTTP archive (.har) format has been designed by the web performance working group of the world wide web consortium (W3C) and is used by browsers to store performance data about loaded web pages.
Silk Performer is now capable of converting .har files into capture files, which is an alternative to the conventional recording approach. When you import an .har file into the Workbench, Silk Performer automatically converts it to a .spcap file and displays the Capture File page, which you can use to tweak the script generation process by applying filters, adding recording rules, and more.
When generating a script from a capture file, post data fragments exceeding 2000 bytes are stored in postbody.data files. In the profile settings under you can now configure this post data threshold. When the data length is below the defined threshold, the data is written to the script during script generation. When the data length exceeds the threshold, the data is stored in a separate postbody.data file.
The time to interact (TTI) has turned out to be the best way of measuring the response time of user interactions with modern web applications. The TTI metric can not only be measured for actions that trigger browser navigation. It can now also be applied to measure actions that trigger asynchronous requests using JavaScript and even actions that do not produce any network activity.