RoseW wrote:

In Lightroom menu HELP ...go to System Info (at the bottom of list)

This is the first lines of info for my desktop.
The memory used by Lightroom is HALF(897mb) of the total available as it
SITS IDLE.

Lightroom Classic version: 7.2 [ 1156743 ]
License: Creative Cloud
...
Built-in memory: 16326.8 MB
Real memory available to Lightroom: 16326.8 MB
Real memory used by Lightroom: 897.6 MB (5.4%) -- 5.4%, not 50%
Virtual memory used by Lightroom: 966.4 MB

How is 897.6 *MB* considered half of 16 *GB* of system RAM? Lightroom
is using under 1 GB from 16 GB available. That's under 1/16, or 6.25%,
not 50% (half).

From the above Help information:

897.6 MB / 16,326.8 MB = 0.0549, or 5.49%. That's one-ninth of your
claim of 50% memory usage. They even tell you in the Help info that
Lightroom is using 5.4% of your system RAM. Just how did YOU compute a
50% memory footprint?

For Lightroom at 897.6 MB to be using half of your system RAM means you
would only have 1.785.2 MB (or ~1.8GB) of system RAM but the Help info
clearly shows you have 16 *GB* of system RAM.