External Facing Portal --poor performane , for tuning-what to check

Dear Gurus
we are using EP7.0,(Backend systems SRM, DI)( oracle 10.2.0.2, AIX 5.3) it is working fine locally, but When it is accessed through internet and when the users are more(300+). the performance decreasing drastically,we have RAM of 16GB in portal production system, is there any thing need to be tuned when accessing throgh internet, i gone though the notes "external facing of portal", still i have problems, i did db statistics update with brconnect.
we are using APache as reverse proxy latest version.
These are the Alerts i got from sap management console
Services\Http Provider\Total requests\ Avg request-response time     182330 ms > 120000 ms last reported Value above threshold     2008 08 26 00:35:57
Services\Memory\ UsedMemoryRate     98 % > 95 % last reported Value above threshold     2008 08 26 16:43:37
Security\Aggregated Data\ InvalidSessionsCount     1109 > 200 last reported Value above threshold     2008 08 25 02:01:25
Web Container\ CurrentSecuritySessions     517 > 500 last reported Value above threshold     2008 08 26 10:26:28
Log Configurator\General\ TotalLogFilesSize     262166 KB > 262144 KB last reported Value above threshold     2008 08 26 14:06:36
Kernel\Application Threads Pool\ WaitingTasksCount     1 task > 0 task last reported Value above threshold     2008 08 25 16:24:33
Services\Security\Aggregated Data\ ActiveSessionsCount     229 > 200 last reported Value above threshold     2008 08 26 07:41:34
Please guide me what could be the reason, atleast from where can i start tuning....
Thanks in advance

Hi Gourav Sharma
Operating system in which portal is installed: AIX 5.3
Quality packs for Java :
12Oct07 caix64142ifx-20070924{SR9 + 120478 + 119973 + 121859 + 122167 + 122541 + 123718} solves )
JVM settings maxheap size is 2048
SAP WebAS for Java EP7.0
Network traffic in Portal cluster
Portal platform u2013 initial page, JCO, PRT, PRT cache
Browser IE 6.0 SP2
I gone through the servicemarket place but i could not find the material related to EP7.0 performance tuning.
is there any specific link which can i get the exact document which suits for our installatin.
Regards,
Balaji

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