I see two problems:

1) indicator-multiload is causing (via dbus?) hud-service to do
"something"  (update/reload cache?) each time indicators get refreshed.
indicator-multiload does not do any "strange" network activity by
itself, strace shows quite sane behavior (access to /proc and /sys and
such).

2) each hud-service "update" initiated by  indicator-multiload is
casuing some 0.5MB network exchange (if home directory is on NFS), about
half with nfs port and half with nfs lockd. I tcpdumped both sessions.
Lock protocol is all binary, looks like repeating lock requests. On nfs
port, it does the same over and over again. I counted this snippet
called 88 times during one hud-servide "update":

q.........O.W.7|N.O... ..yO... ..y............SQLite format 3......@  
.........................................................................-.!
.....I....I.........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................W.../..windexapplication_indexusage.CREATE
 INDEX application_index on usage (application)\........tableusageusage.CREATE 
TABLE usage (application text, entry text, timestamp datetime)

As a workaround, I can:
1) reduce frequency of indicator refresh
2) kill hud-service (and so this network activity stops)

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https://bugs.launchpad.net/bugs/998759

Title:
  hud-service frequently tries to accesses non existing files

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