macOS 10.13 (High Sierra) compatibility ?

      I know it doesn't really help you, but just in case - I'm on 10.13.2, on a Hexacore 2013 cylinder-style Mac Pro, which uses an SSD formatted as APFS. My external Thunderbolt hard disk is also APFS. Also have a 2011 MacBook Pro, which works fine too (self-installed SSD formatted as APFS).

      This is the most stable my Virus system has ever been.

      In which case, whatever it is, can't be that MacOS version - in the sense that it causes problems on every system.

      There is an obvious difference for me though. I use Cubase and Ableton, not Logic. I wonder if you could try the demo version of Ableton and see if you have the same problem?

      It'll be interesting to see if you can narrow down what's causing your problems.
      ChrisCabbage with few libraries also open fast in APFS to me, the problem is when they are many (+200 midi files), in APFS it takes 5 minutes and in HFS + it takes 5 seconds to load (with the same number of libraries in the folder!). I do not know if the reason is for the APFS format, but for now it's the only difference I find. I have also tried the vst version and it has the same problem, it takes a long time to boot when there are many libraries on an APFS disk.
      Chris you can try to duplicate successively until you have 300-400 midi files in the Virus user folder, then start the application. If it takes minutes to open, you have the same problem. I just did it, then I copied the same folder in the imac with hfs+ disk and what in APFS were minutes, in hfs+ take seconds. It's very weird.
      To be fair, it's much faster and easier for you to temporarily move some files out of the way, into a temporary directory, than it is for me to start hunting for hundreds of libraries to test out the theory. I'd like to help, but I'm not currently experiencing a problem with my system. ...and given the way I work, if the hypothesis is correct, I'm not likely to hit problems as-is.

      There's also the recent mods Apple made to reduce the impact of Meltdown and Spectre. The fixes for those security holes, mean that performing I/O means a performance hit (data moving between kernel and user space is essentially less optimised for throughput). If you have the very latest security updates, that could be contributing to the problems you're seeing.

      I'd say that it's still worth running this past Access via their support system, since there may be something they can do to reduce the amount of I/O at plug-in start-up time. Not that they're doing much work on the Virus system at the minute...

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