I found the following on Onyx’s support pages:
ONYX RIP Update for Version 7.3.2
ONYX has developed an optimized PDF and PostScript RIP update for Version 7.3.2. The update is focused on increasing overall RIP speed and resolving a number of postscript file processing issues.
The RIP speed optimization targets PDF processing time, improving file processing time by an average of 1015% and up to 50% on some files.
While 7.3.2 offers significant postscript file processing improvements we have received a number of new PDF files that did not process correctly in 7.3.2. This includes PDF files with multiple transparency effects implemented as alpha masks or in conjunction with named spot colors. These PDF transparency file issues, as well as other minor file issues are fixed in this RIP update. This means you dont need to convert files to TIFF before sending them to the RIP, which will save you valuable production time.
Download the ONYX 7.3.2. RIP Patch and technical release notes from the ONYX Download page.