If your other documents do not suffer this problem in AccessPoiunt then the problem is likely to be the document.
Think of things that impact particularly the Ajax client that would be fine in the desktop client.
e.g. do you have a chart, maybe a table with MANY rows displayed. This displayable data would be present in the desktop client as soon as the document is opened but would have to be shipped across the network to the browser in Ajax mode. Avoid table boxes with an uncontrolled number of rows.
