When you have lots of jsonapi routes the \Drupal\views\Plugin\views\display\PathPluginBase::alterRoutes() method does lots and lots of unnecessary work.
Install JsonAPI and views and rebuild the routes.
Using the standard profile this change results in 2220 less calls to \Drupal\views\Plugin\views\display\PathPluginBase::overrideAppliesPathAndMethod(). On a client site which makes heavy use of JsonAPI and has a *lot* of custom entity types and bundles of said entity types this results in 290556 less calls!
Blackfire runs:
Change the order of the if condition.
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Fixed
9.3
Last updated
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
With this optimization we still have O(n*m) cost.
n = number of routes
m = number of views displays with path plugins, or other route subscribers that need to scan all routes.
So there is still a problem on some sites.
Follow-up: 📌 Optimize route subscribers using indexed route collection Active