PHP MSSQL, IIS Question -- Size Question

I am preparing a report for a database at my company that will be shown on the web. It has several nested tables and such in it. One of the fields to show is a blob field. If the blob field is too long, IIS will hang, and not be able to render the table. If the blob field is less than 2K it is fine. Sometimes it is bigger. If I remove the blob field from showing it always works fine, on every record. If I put the blob field in, it will hang on certain records but not all. How can I increase IIS's or PHP's buffer size so that it will render the entire page correctly everytime? Joshua