Firstly, according to Paul Bakaus, a person's consciousness lags about 80 milliseconds behind what is currently happening. Indeed, the subjective present is always an objective past. Moreover, a person will need more time to understand and fully perceive current events if these are more intellectually complex in nature. These factors are true of any person. Thus, all users will unconsciously grant this free start up time for computer processing.

Secondly, the emotional state of the user has a strong effect on perceived time. In a fairly recent study by Awwwards and Google [1], it has been stated that anxious or rushed users will perceive more than 50% of websites as loading slowly compared to less than 25% for calm and relaxed users. This is equally true for users that are on the move compared to those that are comfortably sitting down:

The influence of a person's emotional state or level of activity when it comes to speed perception

Thirdly, age is an important factor when...