Invient charts on Ipad


We are developing a web site that will be accessible on desktop and mobile devices as Ipad.

This application will contain several graphes (bar chart, time lines, pie charts, …).

If it works rather correctly on desktop, we have performance issues with Ipad.
The graphes need more time to appear and it is not done smoothly (especially the time line).

I tried to connect to the sample web site of Invient chart and I had the same issue.

I am using the Ipad 1 with iOS 4.

Are there recommandations concerning the use of Invient charts on Ipad ?

Thanks in advance