The Land Information Management System, sometimes referred to as the 'Ardhisasa System.' Ardhisasa offers a comprehensive platform for land transactions, enabling users to do various online activities like land registration, valuation, surveying, adjudication, planning, and allocation. The creation and execution of Ardhisasa in Kenya has encountered several hurdles. This research will evaluate the impact of system modernisation and process optimisation on the performance of the National Land Information Management System in Kenya, specifically targeting the Ardhisasa System.The research was informed by the Information Systems Success Model and the Technology Acceptance Model. The research used a descriptive design. The target demographic would consist of the personnel employed at the National Land Commission Nairobi Office and the Ministry of Land, Housing and Urban Development, together with their customers in Nairobi County. The multiple regression analysis reveals a robust positive correlation (R = 0.599) between critical system modernisation, process optimisation, and system performance, underscoring their combined significance. The modified R Square value of 0.342 indicates that these parameters explain around 34.2% of the variation in system performance, underscoring their importance in enhancing effectiveness. Increases in system modernisation and process optimisation correspond with respective performance gains of 0.496 and 0.178 units. The results underscore the need for stakeholders to design and execute comprehensive process optimisation and system performance strategies to improve the overall efficacy of the National Land Information Management System in Kenya. The findings demonstrate that enhancing process optimisation and system performance components can substantially improve overall system efficacy, aligning it with user requirements and expectations.