CI Catalog index page has unexpected slowness

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When looking into what impacted our error budget last week, we noticed two Catalog index related items:

• Explore::CatalogController#show
• Explore::CatalogController#index (an alias for show)

From the relevant dashboard:

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While we recently fixed how some metrics displayed on that page are calculated ( !206080 (merged)), that calculation doesn't happen when the page itself is loaded – so this shouldn't have had an impact. Looking at older data, the apdex value was in the red before this change as well, though usually in the >99.5% range. It's possible that an incident last week negatively impacted things here beyond the normal range. But even for the last 90 days, the average is just 99.71 and should be better.