'Updating Last Seen' and 'hijack topics timings' and 'Track Visit' is still running after 90 seconds

Product Support
8 
  ## Set db_shared_buffers to a max of 25% of the total memory.
  ##
  ## On 1GB installs set to 128MB (to leave room for other processes)
  ## on a 4GB instance you may raise to 1GB
  db_shared_buffers: "2048MB"