<div dir="ltr"><span style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;display:inline;float:none">Hey Folks,</span><div class="gmail_quote"><div dir="ltr"><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><br></div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">Activity Stream was released as the default<span class="m_2415390821703924216gmail-Apple-converted-space"> </span><a>about:newtab</a> and<span class="m_2415390821703924216gmail-Apple-converted-space"> </span><a>about<wbr>:home</a> experience for Firefox Quantum just about three weeks ago.  The team is proud to report that Activity Stream is performing well in release!</div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><br></div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">Here’s a cool graph from the <a href="https://sql.telemetry.mozilla.org/dashboard/activity-stream-system-addon-metrics-summary_1?p_channel=release&p_granularity=week">Activity Stream main dashboard</a>:</div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><br></div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><img src="cid:ii_160277e42dcf0f70" alt="Inline image 1" height="150" width="547"></div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><br></div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">This is the engagement rates of the various Activity Stream sections/components for both<span class="m_2415390821703924216gmail-Apple-converted-space"> </span><a>about:home</a> and<span class="m_2415390821703924216gmail-Apple-converted-space"> </span><a>about:<wbr>newtab</a>.  Note that Activity Stream is an almost identical experience on both pages.  The first thing you notice about this data is that people are using the Home and Newtab pages very differently  -  more people interact with Activity Stream on <a>about:home</a> (49%) than on<span class="m_2415390821703924216gmail-Apple-converted-space"> </span><a>about:newtab</a> (34%).  </div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><br></div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">The engagement gains on<span class="m_2415390821703924216gmail-Apple-converted-space"> </span><a>about:home</a> appear to be spread across the board:  Top Sites (from 20% to 28%, a +40% gain), Search (from 11% to 17%, a +37% gain), Highlights (from 1.6% to 2.6%, a +62% gain) and Pocket (from 0.13% to 0.34%, a 161% gain).  The explanation for this difference could be that people use the Newtab page mostly to go somewhere they already have in mind, whereas they use the Home page  to discover new things or to go to places they have been to before.  </div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><br></div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">This is just one of the insights we have gained since launch.  We are using results like this to help improve the browsing experience for our users.</div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><br></div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><b><u>Performance / Perceived Performance</u></b></div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><b><u><br></u></b></div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">In the lead up to Firefox Quantum, we worked closely with the Quantum Flow team to understand what role Activity Stream played in <a href="https://health.graphics/quantum" target="_blank">core performance targets</a>.  We were eager to make sure we weren’t regressing any existing metrics and focused hard on the specific case of <a href="https://github.com/mozilla/activity-stream/issues?utf8=%E2%9C%93&q=label:Startup+" target="_blank">improving/optimizing browser startup</a>.  </div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><br></div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">In the 58 cycle, we have had a lot of conversations with Dominik and Florian about the study of the ‘perceived’ performance of systems like Activity Stream.  We identified the key events in the starting of Activity Stream and set to work improving the important browser start-up metric.  We found video A/B comparison tools to be invaluable for this work.</div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><br></div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">The link below is a video comparing Browser Startup of Firefox 57 and 58.  Note that to focus on just looking at Activity Stream, we do not include the entire startup sequence of the browser.  We have synchronized the two videos to start at the ‘first paint’ event of the overall Firefox startup sequence.</div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><br></div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><a href="https://drive.google.com/a/mozilla.com/file/d/1-ZyNfr9ib82s_1gMLUOYFCe6WSmU-ot8/view?usp=sharing" target="_blank"><img src="cid:ii_16027828ddd66118" alt="Video Browser Startup Firefox 57 vs. 58" height="290" width="547"><br></a></div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><br></div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><br></div><br class="m_2415390821703924216gmail-Apple-interchange-newline"></div>
</div><div>That's pretty cool.  Notice how we 'get something on screen' early, which is a big perceived win, but also crushes the overall perf numbers from the previous version.  <br></div><div><br></div><div>We are going to keep this work up.  Our #1 priority over the next few releases is improved performance and stability.</div><div><br></div><div>cheers,</div><div>tim<br></div></div>