Your DUPR rating adjusts dynamically with each match you play. When you first start recording matches or return after a long break, you might notice significant changes in your rating. This is because the system is in a calibration phase, adjusting to align with your current skill level.
For players who regularly log matches, the influence of each individual match on your rating becomes less pronounced. As the system gathers more data about your performance, the movement from each match played lessens, resulting in a more stable and accurate rating over time.
The extent to which your rating changes after a match depends on various factors. Matches against opponents with well-established and reliable ratings can affect your rating differently than matches against newer or less consistent players. Moreover, the nature of the match—whether it's a casual game or a competitive event like a club match or tournament—also plays a role in how your rating adjusts.
Rating adjustments are proportional to the amount of new information the system gains about your playing ability. This approach allows new players to quickly achieve a rating that reflects their true skill level while providing stability for established players who have logged numerous matches.
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Source: https://dupr.zendesk.com/hc/en-us/articles/23195770309524-How-can-I-expect-my-rating-to-move-from-a-Match