You can add scripts to the URLs you test. When you edit a Site in your Settings, there's a script icon next to each URL that allows you to add scripts.
With synthetic scripts you're able to do all sorts of things, such as add headers, set cookies, step through a number of pages, or perform actions on a page like logging in or adding an item to a shopping cart.
There are a few things to be aware of when writing synthetic scripts for SpeedCurve:
More complex scripts will sometimes end up generating results with multiple steps, like this:
SpeedCurve will not be able to parse these results, because it does not know which step to use as the final result. Use the
logData command to isolate the specific step you want to be displayed in SpeedCurve. You can avoid generating multiple steps by putting
combineSteps at the top of your script.
setEventName command creates an extra step in the test results, which SpeedCurve cannot parse (see above). You should avoid using this command in your scripts.
Lighthouse doesn't support the majority SpeedCurve synthetic scripting. The only commands currently supported are setHeader and navigate. You can pass any headers required for cookies or authentication via setHeader. The URL tested in Lighthouse will be the last URL specified via a navigate command.
There are a number script templates available that will generate a script for you using the URL field.
Loads the page a second time allowing you to measure the cached performance of the page. Note that this requires adding 'repeat view' as a separate test URL in your settings.
Only allows requests for the first party domains listed. Great for blocking all third party requests to ad providers, analytics tags etc. so you can measure the performance of the assets you control. Once you add the script you can manually edit it to add more space delimited first party domains if needed.
Progressive Web Apps are great for delivering content while offline. This script loads your PWA, then blocks all network requests and reloads the page again allowing you to check what the offline performance is like and ensure that the user experience is still rendering via the filmstrips.
Some ad providers block all requests that include "PTST" in the user agent . This can skew your metrics if you want to test the full page load including ads. This script adds "speedcurve_removePTST" which does what it says on the tin.
We've added support for preserving the user agent string and not adding "PTST". Some ad providers block all requests which include "PTST" in the user agent and this can skew your metrics if you're wanting to test the full page load with ads. To remove "PTST" from the user agent string you can add "speedcurve_removePTST", a tab, and then "1" to your script to remove it.
Clears the OS certificate caches which causes IE to do OCSP/CRL checks during SSL negotiation if the certificates are not already cached.
Updated about 2 months ago