TLDR

When using the BlueSCSI on a Vintage Mac you can expect about 1.2MB/sec read, 1.2MB/sec write, 1ms seek. Keep reading to see what factors may influence your speed.

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Influences on speed of BlueSCSI

These are 25-30 year old computers, there are many things that change the profile of the performance you get.

The main thing to remember is to enjoy your vintage computer.

SCSI Driver

On Macintosh drives there is a SCSI Driver installed. Some drivers preform better or worse on different machines. Learn more here: https://github.com/erichelgeson/BlueSCSI/wiki/Disk-Drivers-(Mac)

Testing software

Most users use SCSI Director Pro 4 but other software may provide different results.

Host machine

A PowerPC machine is going to have faster access than a Plus or SE.

SD Format

Using exFAT as the format will provide a substantial increase in speed over FAT32.

SD Card

Quality, name brand SD cards can provide a gain in performance over no name or fakes.

BluePill

The CKS32 clone does benchmark slightly better than the STM32, though it is a very small difference. Other clones, fakes, etc show little to no difference.

Comparing to Spinning Disks

Spinning HDD have higher read/write speeds, but the BlueSCSI (and all modern SCSI SD solutions) "feel" faster due to the near instant seek times.