Postgres 9.3 beta log

Hello and namaste,

I have installed the latest version an running tests on it.

Since i analyze logs , i have found three new entries in log for each insert statement
which isn't present in postgres 9.0 log

---
2013-08-10 11:59:27.031 IST,"postgres","aeppos",2780,"192.168.10.19:50935",5205dd5b.adc,352787,"idle",2013-08-10 11:57:39 IST,5/129358,0,LOG,00000,"PARSER STATISTICS","! system usage stats:
!    0.000000 elapsed 0.000000 user 0.000000 system sec
!    [43.227877 user 19.250523 sys total]",,,,,"insert into loginmaster                    (loginid,fullname,empid,passwd) values (                        'login88193', 'fullname88193', 'empid88193', 'passwd88193')",,,""
2013-08-10 11:59:27.032 IST,"postgres","aeppos",2780,"192.168.10.19:50935",5205dd5b.adc,352788,"INSERT",2013-08-10 11:57:39 IST,5/129358,0,LOG,00000,"PARSE ANALYSIS STATISTICS","! system usage stats:
!    0.000000 elapsed 0.000000 user 0.000000 system sec
!    [43.227877 user 19.250523 sys total]",,,,,"insert into loginmaster                    (loginid,fullname,empid,passwd) values (                        'login88193', 'fullname88193', 'empid88193', 'passwd88193')",,,""
2013-08-10 11:59:27.032 IST,"postgres","aeppos",2780,"192.168.10.19:50935",5205dd5b.adc,352789,"INSERT",2013-08-10 11:57:39 IST,5/129358,0,LOG,00000,"REWRITER STATISTICS","! system usage stats:
!    0.000000 elapsed 0.000000 user 0.000000 system sec
!    [43.227877 user 19.250523 sys total]",,,,,"insert into loginmaster                    (loginid,fullname,empid,passwd) values (                        'login88193', 'fullname88193', 'empid88193', 'passwd88193')",,,""

---

as you can see it is for a single record "login88193" it places

PARSER STATISTICS
PARSE ANALYSIS STATISTICS
REWRITER STATISTICS

I know it appers because i have enabled log_parser_* options in log

But what i request to know is the meaning of these statistics and how usefull is can be for a server load  evaluation

thanking you
greetings from india
arvind