Serialized wp_watevermeta data causes performance problems only if you need to search for it. For example if you want to find all the red cars it’s faster to use a WP_Meta_Query operation than it is to read each car’s deserialized metadata and examine the data structure for the color.
It’s slow, sometimes painfully slow, to search serialized data.
It’s true that fewer wp_whatevermeta rows are slightly more efficient and easier to troubleshoot than many such rows. Search ability is the only important tradeoff.
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