Ron
Have you set virtual memory to a static size or is it configured to "let Windows decide?" I have an article dealing with configuring virtual memory for best performance in the
eCabinets Tips & Tricks forum at eCabWorld.
Another thing you can check is to make certain that "Compress files to save disk space" is not turned on. Check this by opening My Computer then right-clicking on the C: drive and choosing Properties. On the same dialog is another option that can cause disk performance issues. The "Allow Indexing Service to index this disk for fast file searching" will speed up searches for files but can slow performance when creating new files. I would say that a temporary file is created every time you click the Presentation View button. If you have a lot of files (>500,000) on the disk, this can slow creation of new files somewhat.
Disk indexing does not cause as great of a performance issue as does not having virtual memory set to a static size. I have about 800,000 files with indexing turned on and do not notice a siginificant decrease in performance when creating new files.
Defragmenting your disk drive on a regular schedule (I defrag weekly) can help performance significantly also. Keeping the disk cleaned of temorary files will also help performance.
Now, having said all of that, you will still experience some performance issues when creating the Presentation View if your room has lots of knobs/pulls and certain moldings (rope molding in particular). These items have tons of 3D coordinates and consume a lot of memory.