Where is the data coming from, and where is this filter that you're referring to? If you're referring to a SharePoint list with 100+ items, then simply create a view only showing the most recent 100 items and create a data connection accordingly (for a rich client form). For a browser-enabled form, create a custom view that only shows the most recent 100 items, and then create a data connection for the XML view of that view so that your form only pulls down what shows up in that view even in browser mode.