UVI Workstation sample streaming issue

Recently I’ve started seeing a very disturbing issue with UVI Workstation, most notably when using the UVI Ravenscroft Piano library. Firstly the plugin takes ages to load - I’m sure it’s a lot longer than it used to be (although I never really took much notice, so it’s hard to know). But most annoyingly, after loading the Ravenscroft Piano library many of the notes get abruptly cut, and I see the Cantabile load going way over 100% (often into the thousands). I see my SSD usage maxing out in Task Manager. If I play the same note a few times, it’ll eventually play properly, but then once I try another note, it’ll do the same thing.

It feels like the plugin is trying to load the samples off disk, but just failing to do so anywhere near quickly enough. But once they’re loaded and cached in RAM, those notes are ok. But this is from an SSD, on a Core i9 machine - it’s not some ancient low-spec machine.

But the thing is, I never used to have this problem. I’ve played many live shows using this plugin, and never ever seen this before.

Would love to hear any ideas about what could be causing this, and how it could be remedied.

Thank you in advance!


Hi Neil

Have you tried a current version of the UVI Workstation? They seem to have updates regularly.



Yes, I was only a couple of minor versions behind the latest, and upgrading to the latest doesn’t appear to fix anything.

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Hey Neil,

Are there other sample libraries on the same SSD you can test to see if they are having streaming problems? Just wondering if a hardware thing is going on. The only streaming adjustments are in the workstation and I assumed you check them out. Not sure if there is a utility to test the SSD hardware, some manufacturers have utilities, it might be an idea to look at as well. Also a latency monitor check might be helpful to rule out anything else that may be blocking the disk activity by hogging interrupts.


Thanks @dave_dore, yes, sample streaming does actually appear to affected in other plugins. For example, the Kontakt factory samples have a very noticeable latency of probably 100-200ms on notes played for the first time. After that, further plays feel pretty instant, as if they’re then coming from RAM.

The other thing is that I’m sure my large pre-loaded setlists are taking longer to load too, suggesting this could be a general disk speed issue.

Latency monitor is showing the machine to be running super-smooth, with no spikes or such.

I tried running AS SSD Benchmark, which gave a sequential read speed of 476MB/s, and 4k random read speed of 34MB/s. Those appear to be in the expected ranges for my drive (Western Digital WDS100T2B0A).

However, it does reporter a read access time of 0.699ms, which sounds pretty high maybe? Write access time is 0.096ms, which seems great, but I’m obviously doing mostly reads when streaming samples off disk.

Puzzling and annoying…


Anti-virus activated?


You would have to see what 0.7ms is referring to. I don’t think it’s per byte, that would be way toooo high. Maybe it’s bytes-cluster read-time, so (assuming a 32KB cluster), to 0.000022ms.

About the write time, there is a easy explanation: when you write to the SSD, you are actually writing to a RAM buffer, the real writing occurs in background. It’s weird a disk benchmark prog doesn’t provide easily understandable report.

Addition to Torsten’s helpful suggestion: after disabling Windows Defender, also disable all related notifications, which are very annoying. If you want to do it in a more “simple” way, there is a nice free utility, which allows you to do many useful tweaks to Windows. Drop me a line if interested. I’ll post the link and few screenshots about the procedure.