Google Maps In IE8

I am developing a html application using Google Maps.

1) Parse coordinates of particular region, say India,from Json

2) Using these coordinates and Google Maps javascript api V3, I draw a polygon as region boundary over map.

Parsing and drawing polygon are working fine over other browsers. But IE8 skips certain coordinates when number of coordinates are large.

We get a pop up saying " A script is running and taking too much time making your browser unresponsive. Would you like to continue?"

Also, map loads slower on IE8 if compared to Chrome, Firefox or Safari.

 Query :

1)Can we anyhow avoid this pop up on IE8?

2) Any way to increase rendering speed over IE8?

Thanks in advance.