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Gamin will only provide realtime notification of changes for at most n files,
where n is the minimum value between (kern.maxfiles * 0.7) and
(kern.maxfilesperproc - 200). Beyond that limit, files will be polled.

If you often open several large folders with Nautilus, you might want to
increase the kern.maxfiles tunable (you do not need to set
kern.maxfilesperproc, since it is computed at boot time from kern.maxfiles).

For a typical desktop, add the following line to /boot/loader.conf, then
reboot the system:

    kern.maxfiles="25000"

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