The Internet is an essential tool but can be disruptive distraction. Using wifi usage and student grade data from the Faculdade de Engeneharia da Universidade do Porto (FEUP) in Portugal, we find a consistent, positive correlation between Internet usage and student performance. This result is robust for several models and and for different metrics. Models controlling for usage specific to major and curricular year, and for separate day and night usage, reveal that certain categories of students tend to use wifi more productively; in particular, Civil Engineering students, daytime users, and students closer to graduation. Further, we develop an instrumental variable approach that may lead to an assertion of causality. Our results are contrary to previous results in higher education, and also for secondary education in Portugal, thus raising further questions about how different implementation strategies and deployment contexts can yield different academic outcomes in the presence of technology such as wifi.