2017 wikitext editor performance improvements

Background
This is a project to improve the performance of the 2017 wikitext editor.

Updates
Note: This section is currently very incomplete. Do not trust this page to be be an accurate chronological representation of events whilst it is still being drafted.

2nd March 2018
The first performance report has been published at Contributors/Projects/Editing performance. This report explains the baseline performance metrics before the changes on 16th January 2018 were made.

16th January 2018
A patch was merged to significantly reduce the amount of time it takes for the 2017 wikitext editor to become interactive. As with the event logging changes below, it will take time for the changes to roll out, and it will be necessary to wait some time to gather enough data.

See T184614 on Phabricator for additional technical details.

7th December 2017
Additional event logging was added to the visual, 2017, and 2010 wikitext editors to better understand performance. The data collection will take some time to roll out to production. After that, it will be necessary to wait around a month to gather sufficient data to generate a report.

See the Edit schema on Meta-Wiki for additional technical details.