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Dear Sir:

How are those HDD drives connected to the computer, what is the interface?

Have you performed any hard drive transfer speed tests?

Please try copying about 50 files to an internal SSD and see if the problem persists.

If it works with SSD OK, please have a look at recommendations on https://www.fastrawviewer.com/usermanual14/performance-settings to tune performance settings, they depend on the drive type and the type of the interface. You can also use the Manual (pdf) that comes with the installation, it is accessible through FastRawViewer main Menu - Help - "PDF Manual", and is fully searchable.

Our e-mail for such issues is support@fastrawviewer.com - please don't hesitate to use it in case of any problems.