Categorize: ready-to-work & pre-req-needed items from "Which fenix areas to improve?" meeting

[mcomella]

In our meeting doc, we collected several items under the "What areas of the code should we look into?" bullet. We want to bucket them into a few categories:

• "Which items are ready to start working on?" (e.g. WARM start up is immediately actionable)
• "Which items require pre-work and, briefly, what is that pre-work?" (e.g. we need to know if users use the search widget or not before we invest in it)

Please try to complete this before the planning meeting on Tuesday.

[MarcLeclair]

From what I gathered, this is what I thought was the most appropriate:

Ready to work:

• WARM startup --> looking at more in depth / engineering work on this
• A more "realistic" view of startup --> I.e: older profiles, profiles with add-ons, etc...
• Disk reads --> Desktop focus is reduced/eliminating disk reads. We could investigate our disk reads on startup.
• Firefox Accounts --> Investigate interaction with syncs and its responsiveness
• APK size --> investigation could be done by us.
• Regression testing --> depends on how our user feel performance is for Fenix.
• Battery useage --> We had some reports about battery useage / multiple jobs that triggered the battery. Maybe we could look into that
• Memory footprint

Not Ready to work:

• PWA, SPA (single page app) – emerging web. --> we would need more telemetry. One comment: "a lot of web built this way. Catch: don’t really have metrics"
• Search widget --> How many people use it. We could use some telemetry for it.
• Data usage --> Maybe need more metrics.
• Video player --> Video minutes played is correlated to time spent in browser. However, those numbers come from the desktop side, maybe we should do our own analysis on mobile.
• MAIN Tab restoration --> could be tested / add telemetry
• Old profiles--> could be tested / add telemetry
• Profiling startup through simpleperf --> could be tested / add telemetry
• The content-preview mode ad --> could be tested / add telemetry