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Measure and Optimize Web Performance

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### Have you read the documentation? - [X] Yes, I've read the [how to make a reproducable bug guide](https://www.sitespeed.io/documentation/sitespeed.io/bug-report/) - [X] Yes, I've read the [how to debug my script...

bug

Today SPA only works if it makes a request in the soft navigation because we try to generate a HAR and that part breaks. Maybe we could do some smart...

enhancement

It's probably worth waiting until FCP and FP is supported: https://developer.chrome.com/blog/soft-navigations-experiment/

enhancement
upstream

### Have you read the documentation? - [X] Yes, I've read the [how to make a reproducable bug guide](https://www.sitespeed.io/documentation/sitespeed.io/bug-report/) - [X] Yes, I've read the [how to debug my script...

bug

### Feature/improvement Currently browsertime adds a delay after the gecko profiler start command: https://github.com/sitespeedio/browsertime/blob/79e9b0e1f72c3005641b1131173cdaaf24f93a51/lib/firefox/geckoProfiler.js#L89-L90 This was because previously we didn't have a way to properly await for the profiler start...

This patch updates the visualmetrics.py and visualmetrics-portable.py scripts to allow it to identify and record timestamps for frames that match the given color configuration. This consists of an RGB value...

> '"headers" not supported yet in network.continueRequest', Example on how to set request headers in Bidi if will be available in continueRequest?

This PR adds the ability to gather power from USB power meters that are supported by the `usb-power-profiling` module: https://github.com/fqueze/usb-power-profiling The capability is added to both Firefox, and Chromium-based browsers....

### Have you read the documentation? - [X] Yes, I've read the [how to make a reproducable bug guide](https://www.sitespeed.io/documentation/sitespeed.io/bug-report/) - [X] Yes, I've read the [how to debug my script...

bug

### Feature/improvement The `os` module can be problematic when it's used for path manipulations across multiple operating systems. It would be good to convert the `visualmetrics-portable.py` script to use the...

Visual Metrics