A computer-implemented method mitigates distractions that are provided by a computer system in order to improve an overall functionality of the computer system. One or more processors identify a task T that has a completion deadline, where task T is performed on a computer system. The processor(s) identify one or more activities At that are required to complete task T, as well as a dedicated focus of attention time Ft that is required of a user to perform the activities At. The processor(s) monitor activities of the user to determine a focus of attention time Fi for each activity Ai performed by the user, and accumulate the focus of attention time Fi for activities into a bucket for Ft and a bucket not for Ft. The processor(s) then alter a functionality of the computer system in order to improve an overall functionality of the computer system when performing task T.