TIF vs JPG - Performance

[Léveillé, James]

Hi,
 
I've been using MapServer for a while (Oracle 10g, MapInfo, Shape Files,
etc.) - everything works great !
 
For the first time, we want to use raster data - over 6000 orthophotos.
All the orthophotos are available both in TIF and JPG.
Every orthophoto if about 80 Mb in TIF (includes multi-res) and about 4Mb in
JPG.
 
2 Questions :
 
- Is there a concept of multi-res in the JPG format (as in TIFF) ?
- Which format should I use to acquire the best performance from MapServer
??? 
 
Thanks a lot.
Regards.
 
__________________________________________
James Léveillé
 
Intélec Géomatique
420, boul. Charest Est
Bureau 400
Québec (QC), Canada
G1K 8M4
 
Intélec Géomatique: 418.687.5000
MTQ: 418.380.2005 (#227)
 
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