Low performance when connected users exceed 250 in OAS10g

hi,
in OAS10g app server whenconnected user to app server are less than approximately 250-280 every thin is good and there is no performance problem,
but where connected users exceed 280 , server response to requests such as opening a form(without query data from db ) took 10-12 seconds.
in this case Os resources are: cpu usage <45% and mem usage <50%.
is it HTTPServer performance issue?
how can i solve this problem?
thank in advance
carol.

You can try to change the JVM for Forms Servlet, maybe add more Threats with more memory assigment and that this threats get distroyed after resolving certain number of request, also in Apache, you may want to increase the number of MaxClients Directive, as well the Max Connections in WebCache.
Greetings.

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Low performance when connected users exceed 250 in OAS10g

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