bus_message_print_all_properties() inserts every name it walks into the found-properties set, but the set is only used to report missing requested properties at debug level. Request the set from systemctl only when properties were specified and debug logging is enabled, avoiding the unnecessary work in normal operation. In my tests with `systemctl show` over 160 units this brings the instructions retired from 1167.8M down to 992.6M, a reduction of 15.0%. The output is unchanged.
System and Service Manager
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