Poor category TTFB performance after 2.4 update caused by list.phtml

Since updating to 2.4 we have some categories with a TTFB of over 2.0 seconds.

After profiling the category pages we found that the Mageplaza/LayeredNavigationPro/view/frontend/templates/type/list.phtml has 35 requests each taking around 400ms.

This 35 figure I imagine is the amount of filterable attributes the category page has.

Even if I disable Mageplaza Layered Nav module even the core list.phtml returns a similar result e.g. 35 requests at about 380ms

Anyone else experienced this? Of course it’s only really an issue with categories that have a high amount of filterable attributes but unfortunately due to what we sell most of our categories have a large number of filter options

submitted by /u/iSpiKedfd
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