A clarification:

While the first part of my mail described slow access on network volumes,
the last part (see below) is about a local (non-SSD) hard disk. So the
slowdown is not limited to network file systems.

Actually, anohter customer just contacted me who noticed the same slowdown
> at even greater intensity when he upgraded from 10.7 (I believe) to 10.11.
> His disk is near-full, so probably has a highly fragmented directory, and
> he has only 8 GB of RAM (while I have 20). Acitivity monitor shows that the
> "Cached Files" is about 2 GB in his system, and about 5 on mine. So it
> seems that recent OSX versions limit the file/dir cache to a percentage of
> the RAM, whereas old systems used it all when available. Is that so?
>

Thomas
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