This study goes more deeply into the critical aspects of understanding knowledge management, e-governance, and performance efficiency in the Saudi public sector. Simultaneously, the main target is first to grasp how these aspects influence this kind of effectiveness, especially in light of this significant Vision 2030 of the State. By utilizing a technique, the research exploited determined it utilitarian of SMART PLS software to model Structural Equation Modeling (SEM) structure. The study involved 170 people, from the highest-level executives to entry-level employees and cross-section management, administration, and IT specialists. The given article will pursue the complexity of the characters’ interactions while revealing some of the book’s central lessons. T for this study tool, an elaborate questionnaire went through an extensive pretest phase where the content validity and reliability were verified through interviews with expert methods. In 2023, over a quarter of a year data collection period, the self-administered questionnaire was distributed to the representatives of different public institutions, which was done during the year 2023. We obtained some necessary information through the data found and processed using the SMART PLS and SEM. Outcomes highlighted the complex and multidimensional interrelationship of knowledge management, e-governance, and business performance efficiency, from which we make the knowledge of various factors facilitating the performance of the public sector offices in Saudi Arabia. Indeed, it is worth mentioning that the research endorses essential elements in line with Vision 2030, adding tangible directions to the policymakers, government leaders, and practitioners aiming to increase the productivity and effectiveness of public sector projects in the Kingdom.