PROBLEM SHORT: When running multiple occurences of clonedvd simultaneously processing 2 movies at once - my system I/O drops by a power of 10X and the time to process two disks nearly triples. - take it to 3x and performance isn't worth discussing. DETAIL: Running Win 2k pro - clonedvd (latest) and anydvd (latest) 2K version 5.0.2195 SP2 2195 motherboard onboard 4X 32bit ATA 33/66/100/133 AMD 1.2ghz 1 CPU 100mhz front side bus 756 mb ram - average of 4-500MB free during all processing when monitored. total virtual memory 2.3GB avail VM - 1.8GB F is IBM ata100 - E is maxtor ata133 I'm normally a unix freak so this problem is for the windows gurus cuz frankly - I just can't find the info anywhere on how to correct or improve this. I've looked. This is very likely nothing to do with cloneDVD which is a superior product overall. I run cloneDVD and process a MOVIE (any movie) as input from disk F: and I use a seperate disk and IDE channel as cache for the output files E: - then the final product is written to D: Pioneer DVR-108 I pull up performance and check the read bytes/sec and write bytes/sec. Over 20MB/sec - bursting 22-30MB/sec. seems appropriate and I have a DVD in 20 minutes written at 8x. I think why not process two movies at once? So I run 2 occurences of clonedvd at the same time - processing 2 movies from F: - using E: as cache for both and outputing to D: and G: both DVR-108. you would expect some decrease of I/O but total net I/O should be close since I'm doing only READING from F and WRITING to E: this should keep from hammering the drives too much. wrong. My average I/O in performance drops to 1.8MB/sec and the processing time for the set inceases to 1 hour. If I run 3 at a time - disk I/O drops to under 1MB/sec and the time to produce a single dvd5 is 3 hours - 900% increase. As a comparison - I ran eight simultaneous occurences of DVD2OneX on Mac OS X (unix) and for lack of hard disks - simply used / <root> as input and output. The disk naturally was thrashed a bit - but so what - I compressed over 90GB of movies to 32GB appx. in 2.5 hours and cut 8 dvd's. That's pretty normal scaling when you figure it takes 20 minutes to do a single compress. did I miss something or is windows missing something.