Distinguish between lines you want to go up and lines you want to go down
On the "Measurements Over Time" graph on the details page, there are several lines, all plotted against each other, which isn't really a useful way to visualize the data. One helpful possibility might be to separate/distinguish the lines that we want to go up (the scores) from the lines that we want to go down (pageload time, pagesize).
I agree. While I feel like I understand most of the different rankings and whether higher or lower values are good, the graph itself quickly becomes a jumble of lines.