The memoization added in bug 1762212 and bug 1748224 is actually not working.

export const getSourceList = createSelector(
  getSourcesMap,
  sourcesMap => {
    return [...sourcesMap.values()];
  },
  { equalityCheck: shallowEqual, resultEqualityCheck: shallowEqual }
);

Should instead be:

export const getSourceList = createSelector(
  getSourcesMap,
  sourcesMap => {
    return [...sourcesMap.values()];
  },
  {
    memoizeOptions: { equalityCheck: shallowEqual, resultEqualityCheck: shallowEqual }
  }
);

Addressing the memoization on tabs selector doesn't seem to have any impact (which may explain why we missed this):
https://treeherder.mozilla.org/perfherder/comparesubtest?originalProject=try&newProject=try&newRevision=47c1a1c8b65d508ac05422b1c3f87da59bd0ae84&originalSignature=4081483&newSignature=4081483&framework=12&originalRevision=79679e62855c2709162e0e4df966c2c913429990&page=1&showOnlyComparable=1&showOnlyImportant=1
(I imagine the regression on console log is some random noise, but that's weird)

Results are still pending regarding sources selector.

It looks like for sources selector, DAMP doesn't report any improvement either:
https://treeherder.mozilla.org/perfherder/comparesubtest?originalProject=try&newProject=try&newRevision=f5fa5e7fa91d47e133759d9aad5d269fd72694fd&originalSignature=4081483&newSignature=4081483&framework=12&originalRevision=47c1a1c8b65d508ac05422b1c3f87da59bd0ae84&page=1&showOnlyComparable=1&showOnlyConfident=1
(There is still some impact, but it also looks like some noise)

Looking at DAMP, fixing these memoizations doesn't seem to bring any improvement.
So let's remove this broken usage of memoizationOptions.

There's a r+ patch which didn't land and no activity in this bug for 2 weeks.
:ochameau, could you have a look please?
If you still have some work to do, you can add an action "Plan Changes" in Phabricator.
For more information, please visit auto_nag documentation.

Alex landed lots of things around the source tree these days, not sure what's the status of this specific patch

DAMP isn't reliable to be confident about removing these memoizations.
I would need some significant time testing the performance IRL to be sure of the impact of the memoization.

createSelector argument was wrong and weren't doing shallow equal.

https://hg.mozilla.org/mozilla-central/rev/cf36a746e5c6
https://hg.mozilla.org/mozilla-central/rev/fdd5ba505c91

== Change summary for alert #38562 (as of Mon, 05 Jun 2023 07:55:30 GMT) ==

Improvements:

For up to date results, see: https://treeherder.mozilla.org/perfherder/alerts?id=38562