Ah, yes. I'm using Flot and was having trouble getting good looking labels. I'll work on that right away, but in the meantime: X-axis is jobs, Y-axis is seconds to execute.
Might I recommend highcharts? It's a lot easier to work with than flot IMO
You can use Google Visualization API, its really easy to use.
I've been using jqplot recently, which is rather pleasant.