I'm also very puzzled by the Synchron Player's speed readouts.
I recently added a 1TB T7(Touch) to one of the USB-C ports on my 2017 5K iMac (4.2GHz 4-core i7 7700K). This computer came with High Sierra on its internal 2.12TB Fusion Drive formatted as Journaled HFS+, and the only change I've made is expanding RAM to the max 64GB. Synchron Player had previously been showing storage drive read speeds of around 200MB/s to 220MB/s, which seemed ok to me as that's about the best read speed of the internal spinning-platter hard disk.
Initially I formatted the T7 to APFS. Then when, to my horror, I saw that after loading a big SY Dimension Strings preset from the T7 into Synchron Player, the speed readouts were only around 190MB/s, I reformatted the T7 to Journaled HFS+. But Synchron Player speed readouts were still pretty much the same. I've kept Journaled HFS+ in the T7.
I tested the T7's sequential speed with the Black Magic app's 1GB stress test:– 907MB/s read, 833MB/s write. Quite a bit less than Samsung's quoted max speeds as I expected, but not bad.
Then I compared the times taken to load the SYDimStr Violins1/Full/All Players preset (3.1GB) from internal HDD, and then from external T7 (4 threads assigned to loading, 4096 preload). I didn't play anything, just wanted the Synchron Player to measure speed while loading the preset. Each time I ran the test after a reboot so nothing was cached in RAM, and I told Spotlight not to index the T7. The tests were run in LPX10.4.8 which was completely empty except for a single Synchron Player plugged into an instrument strip; audio buffer set at 256.
Timed-test results: Internal HDD:- 9 mins 59 sec; External T7:- 53 sec. Wow! Over 11 times faster!
After loading from the internal HDD Synchron speed showed 259MB/s. But ... after loading from T7, Synchron Player speed readout showed only 202.7 MB/s. How is that logical??
So, Synchron speed readout says the T7 SSD is a bit slower than the iMac's hard disk drive ... excuse me??? Well the nice big fat difference in Synchron preset download times tells a very different story.
I've been building a new VEP7 template for over a week now - Synchron mostly, several Kontakt 6 and a few VIPros, all fed from the T7 - and I'm running increasingly large chunks of score for testing. So far I'm happy with the T7, but dang it, what's up with the Synchron speed test?