Render Times or what is going on in eh?

I was prototyping the use of jscharts in combination with EXTJS. When rendering the charts in IE 8, the time was slow spending a lot of time in the function eh. I profiled the page load with the IE Developer Tool and got the following result for a barchart with 5 data points displaying name and values and 1 tooltip

function eh
Count 22
Inclusive Time 1,273.00
Exclusive Time 1,231.00

I added a pie chart with similiar data set and the time went up to about 1500 millilseconds.
I profiled some of the jscharts examples and found that the times were faster but still spending lots of time in function eh. \
I expect the time is spent in drawing each individual label or perhaps compensating for the lack of native canvas in IE.

Is anyone else seeing this sort of behavior?