Need further interpretation on ADDM Report

Hi,

We have a 10.2.0.3 DB and our Radius Application team is complaining on the slow response of the database during inserts and update..
I checked the ADDM Report and found the following findings ... can someone help me interpret this recommendations, actions and rationale .

FINDING 1: 67% impact (340 seconds)
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Waits on event "log file sync" while performing COMMIT and ROLLBACK operations
were consuming significant database time.

   RECOMMENDATION 1: Application Analysis, 67% benefit (340 seconds)
      ACTION: Investigate application logic for possible reduction in the
         number of COMMIT operations by increasing the size of transactions.
      RATIONALE: The application was performing 508 transactions per minute
         with an average redo size of 1268 bytes per transaction.

   RECOMMENDATION 2: Host