It came up multiple times at recent events that it would be very helpful for people significantly working on Drupal 8 critical issues to get together more often to talk about the issues and unblock each other on things where discussion is needed. While these do not by any means replace the issue queue discussions (much like in-person meetings at events are not), they do help to unblock things much more quickly. We also don't believe that the number of or the concrete people working on critical issues should be limited, so we did not want to keep the discussions closed. After our second meeting last week, here is the recording of the third meeting from today in the hope that it helps more than just those who were on the meeting:

Unfortunately not all people invited made it this time. If you also have significant time to work on critical issues in Drupal 8 and we did not include you, let me know as soon as possible.

The issues mentioned were as follows:

Alex Pott
Rebuilding service container results in endless stampede: https://www.drupal.org/node/2497243
Twig placeholder filter should not map to raw filter: https://www.drupal.org/node/2495179

Francesco Placella
https://www.drupal.org/project/issues/search/drupal?project_issue_follow...
FieldItemInterface methods are only invoked for SQL storage and are inconsistent with hooks: https://www.drupal.org/node/2478459

Lee Rowlands
Make block context faster by removing onBlock event and replace it with loading from a BlockContextManager: https://www.drupal.org/node/2354889

Francesco Placella
FieldItemInterface methods are only invoked for SQL storage and are inconsistent with hooks: https://www.drupal.org/node/2478459

Alex Pott
Rewrite \Drupal\file\Controller\FileWidgetAjaxController::upload() to not rely on form cache https://www.drupal.org/node/2500527

Gábor Hojtsy
Twig placeholder filter should not map to raw filter: https://www.drupal.org/node/2495179

Daniel Wehner
drupal_html_id() considered harmful; remove ajax_html_ids to use GET (not POST) AJAX requests: https://www.drupal.org/node/1305882

Francesco Placella
Node revisions cannot be reverted per translation: https://www.drupal.org/node/2453153
https://www.drupal.org/project/issues/search/drupal?project_issue_follow...

Daniel Wehner
SA-CORE-2014-002 forward port only checks internal cache: https://www.drupal.org/node/2421503

Francesco Placella
Nat: it would be good to have your feedback on the proposed solution the translation revisions issue aside from its criticality (see https://www.drupal.org/node/2453153#comment-9991563 and following)

Fabian Franz
[PP-2] Remove support for #ajax['url'] and $form_state->setCached() for GET requests: https://www.drupal.org/node/2502785
Condition plugins should provide cache contexts AND cacheability metadata needs to be exposed: https://www.drupal.org/node/2375695
Make block context faster by removing onBlock event and replace it with loading from a BlockContextManager: https://www.drupal.org/node/2354889

Alex Pott
[meta] Identify necessary performance optimizations for common profiling scenarios: http://drupal.org/node/2470679

Nathaniel Catchpole
Core profiling scenarios: https://www.drupal.org/node/2497185
Node::isPublished() and Node:getOwnerId() are expensive: https://www.drupal.org/node/2498919
And User:getAnonymousUser() takes 13ms due to ContentEntityBase::setDefaultLangcode() (https://www.drupal.org/node/2504849) is similar.