Hi Steven,
Thank you for your interest in Syncfusion product.
We suggest you to use some Properties and Methods used to improve chart performance. You can find more information about these properties and methods in the online documentation link from below.
http://help.syncfusion.com/ug_83/User%20Interface/Windows%20Forms/Chart/Documents/improvingperformance.htmPlease let us know if you have any concerns.
Regards,
Vijayabharathi K