When running Chrome, the CPU goes into the 15% to 20% range when running the mouse in circles over the chart on my Windows 7 box at work. When running Pale Moo

When running Chrome, the CPU goes into the 15% to 20% range when running the mouse in circles over the chart on my Windows 7 box at work. When running Pale Moon, I get about 10% to 15%, even after allowing all javascript domains in NoScript. Of course, I'm still running an ad blocker and don't see the top and right-hand column ads which makes me wonder if the author happened to catch an ad that was coded badly.