Internet use and wellness are two issues of concern today. People in today's technologically advanced society are depending more on the Internet for their employment, education or leisure activities. There is evidence that it may have detrimental social, psychological or physical effects on people`s lives, especially in young people. But the evidence between internet use and wellness and mental health is variable. Problematic internet use (PIU) has shown a relation with variables of psychological distress (depression, anxiety and stress), and variables as a procrastination in academic, workplace, or situational contexts. Also, there is strong evidence to suggest that experience of time pressure is associated with poorer health, psychological wellbeing and reduced quality of life, where intense time pressure can act as a stressor, which is detrimental to mental well-being. The variability of the studies invited us to explore deeper into the complex relationships between these variables. The objective of this study is to analyze the mediator role of chronic time pressure (CTPI) and pure procrastination (PPS) between the relation of PIU and wellness index (WHO index) in a Spanish sample of young adults. Participants of the present study were 346, 125 young adults between 18 and 24 years (female = 65; male = 55; others descriptions = 5), and 221 adults in early stages between 25 and 34 years (female = 87; male = 134). The Spanish version of problematic internet use scale (PIU), chronic time pressure inventory (CTPI), pure procrastination scale (PPS), and WHO-5 index (WHO-5) was used in this study. Descriptive, correlational, and mediational analyses were used through IBM SPSS v.30 and the process for SPSS v. 4.2. Mediated serial analysis showed a total mediation model only for the group between 25 and 34 years. The model was not significant for the group between 18 and 24 years. The total mediation model showed that PIU has an indirect effect on the WHO index through CTPI and PPS. PIU showed a non-significant and negative relation with the WHO index, but PIU showed a significant and positive relation with CTPI; CTPI showed a significant relation with PPS, and at the same time, PPS showed a significant and negative relation with the WHO index. For the group between 18 and 24 years, the model only showed a significant and positive relation between PIU and CTPI, but none other relations were significant for this age group. The results show that age is related to the perception of internet use, and in turn the relationships between the variables towards the perception of well-being. Evidence in the literature points to the relationship between internet use and the detriment of psychological well-being, but this study shows that younger adults (18-24) do not perceive that internet use decreases their well-being. On the other hand, adults between 25 and 34 years do perceive that problematic use of the Internet will lead to chronic time pressure and procrastination behaviour that will ultimately decrease their well-being. In both cases, it should be noted that the PIU does not show a direct and significant effect on well-being, and that it is the role of other variables that can mediate (CTPI and PPS). It seems, that the way of using the internet is decisive, which leads us to the need to delve deeper into the types of internet use and their use perception, time management, and the different perceptions of well-being and distress.

Keywords: Problematic internet use, pressure time, procrastination, wellness.