Several years ago, I went to a tech roundtable hosted by a well-known company, and this topic came up.

Half the devs in the discussion sincerely didn't believe the new sluggish UI trend found on various social media and news sites was slow at all, because their metrics (presumably which measure some sort of server compute time) said they were not slower. It's some sort of religious fervor.

"Who are you going to believe? Me(trics) or your own lying eyes!?"