Pages on the mobile websites of Fortune 100 companies take five seconds on average to load, much longer than Google's recommendation of one second or less, according to a recent report by The Search Agency.

The agency examined the mobile sites of the Fortune 100 and gave each a score based on five factors: load speed, site format, calculated download speed, social media presence, and app presence.

Site speed in particular was emphasized because of Google's recent mobile best-practices guidelines.

Out of a possible five points—one being the lowest and five being the highest—the average score for the companies in the study was just 2.31.