I take the point about the error message, and I'll see where this comes from.
However I not having much luck in reproducing the issue. I have a test which creates a graphics layer to which I add 5000 polygons each with 10,000 verticies. It takes a while to render and isn't the most responsive map I've ever seen but it's not thowing the error you are experiencing.
It's maybe that you have a lower spec machine, but either way I would encourage you to look at your data and see if it is suitable for the scales you are using it at.
Consider the resolution at which your data was digitised. If you have a coast line which was digitised every 1metre, when you zoom out to a country scale, you will be putting a big load on your database. Consider generalizing your data for certain view scales. This is a very common cause for any GIS or mapping application performing badly or maybe running out of memory in your case.