The way in which instructors work has changed markedly since the introduction of learning management systems (LMS). This paper uses Goodhue and Thompson’s (1995) technology-to-performance chain (TPC) as a starting point to explore the roles of task-technology fit (TTF) and level of LMS use in the performance impacts of LMS for instructors. A mixed method approach was used: an initial quantitative study followed by collection of additional in-depth data using open ended questions. The results showed that whilst TTF has a direct influence on instructors’ perceptions of the impacts of the LMS on their performance, level of utilization is either not associated with performance impact or is associated with performance impact in ways that are not readily captured by simple linear modelling.