>I recently start to use foxypreviewer. Everything looks fine but generating simple reports take a much more time than
>without foxy. I use simple commands
>
>SET ENGINEBEHAVIOR 70
>SET REPORTBEHAVIOR 90
>
>DO FOXYPREVIEWER.APP
>
>_Screen.oFoxyPreviewer.lExpandFields = .T.
>
>Generating to RTF often produce report with blank gaps instead of records.
>
>Where am I wrong?

Yes, using FoxyPreviewer will always be much slower than using REPORTBEHAVIOR 80
Internally, it stores all the report information, every object in some temporary cursors, and treats some data.
Specially for the case using "lExpandFields". This slows down the process even more !
My recomendation is to expand your field widths, and avoid setting that property !

The difference of performance is most noticed in bigger reports. I always avoid generating reports with more than 10 pages. IMHO, it's preferrable to offer good ways to make queries to allow showing the important data.

HTH