Information processing rate (IPR) is an important construct within many psychological theories, e.g., as a component of fluid intelligence and within models that explain links between personality and intelligence. IPR research usually describes it by using average indicators, even though models with non-average indicators have incremental validity and theoretically better describe the proposed dynamic model of IPR. Accordingly, the objective of this paper was to investigate the psychometric sensitivity and validity of indicators of average efficiency and newly introduced indicators of instability and resilience to adverse influences. Their relationships with a measure of fluid intelligence and with relevant Big Five personality traits were analyzed in order to more comprehensively examine the theoretical model and role of IPR. The sample was comprised of 209 students of Faculty of Transportation Sciences and of Croatian Studies University of Zagreb. IPR was measured by the KS2-2 test, fluid intelligence by the D-2000 test and the Big Five personality traits by the IPIP 50 questionnaire. Data was collected by paper-and-pencil instruments in standardized conditions. The consistency of the two samples' results justified their joining and indicated that the studies methodology and instruments where valid. Good psychometric properties of IPR indicators, two of which acted as signifficant predictors of fluid intelligence, confirmed the validity of the assessed IPR model, especially the justifiability of the non-average IPR indicators use, even though indicators of instability and resilience exhibited certain sensitivity constraints. All IPR indicators significantly correlated with fluid intelligence and only partially correlated with relevant personality traits. The obtained correlation mostly corroborated the theoretical expectations, actually exceeded them, when taking the unfavourable psychometric characteristics of nonaverage IPR indicators into account.