Auto-fill is the automatic filling of fields based on previous Marketo data

When the Episerver Connect Marketo add-on you may experience slow load times if there are numerous lists being loaded with autofill. 

If you have several hundred or more lists being loaded on a page you may want to disable auto-fill on forms to improve load times. You can turn off auto fill by updating to the EPiServer.ConnectForMarketingAutomation 4.1.0 package(or higher) and having the user uncheck the auto-fill box on the Global settings page of the CMS admin section.