You can import existing forms into LiveCycle Designer ES. During the import, unnecessary objects may be created.
For example, when importing a PDF form, one text object may be created for each line or word in the original form. The number and complexity of objects increases the file size of the form and decreases performance when rendering the form.
LiveCycle Designer ES provides options to reduce the number of unnecessary objects created. When importing the form, you can choose the Create an Interactive Form with Fixed Pages option or the Create an Interactive Form with a Flowable Layout.
Each option produces different results in terms of the number and complexity of objects on the resulting form. You may find it useful to import the form once using the Maintain Editability option and once using the Preserve Appearance option. You can produce the final form by combining the most appropriate elements from each resulting form.
After importing the form, you can reduce the number of objects on the form by combining related text objects. For example, you can select each individual text object that makes up a sentence and combine them into a single text object.
See also 

Performance considerations for importing forms