Teaching language has challenges for many reasons, including learners' backgrounds, learning styles, motivation, and socio-economic status. However, EFL students can benefit from differentiation across the learning continuum to a large extent. This study investigated Afghan EFL learners' perceptions of differentiated instruction and the factors that contributed to catering to their needs. This study revolved around five main elements of differentiated instruction: learning environment, content, process, product, and assessment. In this study, a questionnaire was developed and distributed to 102 EFL students at Herat University, Afghanistan, to record their perceptions of differentiated instruction in their classes. Three teachers of the English department at the same university were also interviewed to understand their experiences implementing differentiated instruction and identify their tensions. Data from the survey and interviews highlight that while DI requires significant teacher commitment and time, properly designed classes catering to learner specifics can enhance efficiency and be reused in future heterogeneous settings. The study's results suggested that it is practical to implement differentiated instruction in mixed-level, large, heterogeneous classrooms.