System performance data and program performance data may be collected, converted into the same format and correlated by time. A graph or other display of system performance data over a time period may be displayed. A bar may be superimposed on the graph. A corresponding grid or other display, of program performance data over the same time period may be displayed. An item or line of the grid corresponding to a program event at a particular timepoint may be selected. A timepoint in the system performance graph may be selected by adjusting the position of the bar superimposed on the system performance graph. In response to the movement of the bar, the portion of the grid of program performance data displayed may be changed so that the grid of program performance data displays program performance data corresponding to the selected timepoint in the system performance graph.