Bad response time for aRFC

Question

On our R/3 ECC6 production system ,we have one aRFC call by external system,there are 200000 times per day.
and the response time for the RFC call is 35ms ,Some times its response time(commit time) are much longer and up to 2 seconds.
There is very simple code for the RFC as shown below
    insert ztable from table lt_internal_table.
    commit work
    call function 'function_name'
    starting new task 'N'.
    tables
       it_tab = lt_internal_table.
Regards,
ShiChunQing

Answer 1

Dear Randorlf ,
  Now i can determine that  statement "commit work"   have a high cost  some times.
  I write a simple report as show below, 
  One high cost will occurs per several minutes.
  report ztest.
  do  10 times.
    GET RUN TIME FIELD t1.
    INSERT ytest_table FROM TABLE lt_tab.
    GET RUN TIME FIELD t2.
    t1 = t2 - t1.
    WRITE:/ 'insert:',t1,sy-uzeit.
    COMMIT WORK.
    GET RUN TIME FIELD t3.
    t2 = t3 - t2.
    WRITE: 'commit:',t2,sy-uzeit.
enddo.
Run results:
insert:        879  16:23:02 commit:      1,713  16:23:02
insert:      1,607  16:23:05 commit:      4,434  16:23:05
insert:       1,265  16:23:08 commit:      3,790  16:23:08
insert:        648  16:23:11 commit:      1,195  16:23:11
insert:        659  16:23:14 commit:    390,208  16:23:15
insert:        640  16:23:18 commit:      1,032  16:23:18
Best regards
shichunqing