RAID 5 is lousy for sequential (video editing) media, it is primarily used for data base applications.
raid 5 is fine and with the other software performing fine it suggests the speed of the raid should not be in question.
are you getting bad playback on other media formats/codecs or only xf-avc? i don't see alot of xf-avc posts in the premiere forum to confirm a codec problem, but there was a response from Art3misRox in your premiere forum thread confirming a similar problem.
if you are getting bad playback with other media formats, you can search for other threads with playback problems for possible solutions, like some of these.
Choppy footage on brand new pc. (audio settings)
Playback choppy and double speed? (audio settings)
Premiere 2015 - All video playback is now choppy. Why? (deleting all cache, previews, and preferences)
unchecking/disabling "Enable accelerated Intel h.264 decoding" in settings
disabling any display or video i/o hardware and mercury transmit.
you can also try an older version of premiere like 2015.2 Adobe CC 2015 Updates: Direct Download Links
Hi Bill, i never had any speed issues with my raid 5 setup, also i was advised to do so by a major color grading facility; and as Ronin Edits says; on other software it works flawless.
So the Raid is not the problem.
The problem there is not RAID 5 per se – but it's RAID 5 on a shared-bandwidth interface like Thunderbolt that's the problem. What's more, all Thunderbolt RAID enclosures and controllers use only software RAID, which can severely misuse the CPU by not allowing the resources used by the RAID access to any other process.
im not that technical, i only see there has never been a problem with different software, same hardware.
davinci resolve and even final cut pro x.2.2 play the files flawlessly, also after multiple effects, from that same raid 5 configuration.
so it seems the raid system is not the problem.
all Thunderbolt RAID enclosures and controllers use only software RAID, which can severely misuse the CPU by not allowing the resources used by the RAID access to any other process.
there are thunderbolt raid enclosures from promise and areca that have hardware raid controllers. Pim mentions having a pegasus and high end mac pro. so it might be hardware raid and even if it was software raid, it probably has minimal impact on that cpu.
Can you share some clips for me to test?