Slowness on page load with LOVs

Hi people
I am on APEX 3.2 and Oracle database 11.2.0.2.0
I have a page where I have to display 6 list boxes
2 of the 6 list boxes show 10,000 records each
2 od the 6 show 5000 each
final 2 show 1500 each
I have noticed that sometime (not always) this page would take about 3 minutes to fully load and other time it takes 5 seconds to load. The data in the list boxes is coming from SQL queries on some tables. There tables have indexes. Also note that when I run these queries in PL/SQL Developer or SQL-Plus they return records within seconds. Its just on the APEX page where "sometimes" it will just wait for several minutes.
What could be the problem and are there any suggestions to fix this?. I have just read somewhere that I should change shared_server parameter to 5. Right now its 1. I will test this tomorrow morning.
But this has really puzzled me. I have looked at the memory and cpu usage and nothing is happening while it waits for 3 minutes to open the page.
Thanks for your suggestions

Hi there..
Peter is right... Creating a page that has select lists that are that large will rarely be performant. I'm surprised that you get an acceptable result as often as you do.
You have to be careful when comparing the results you're getting in APEX with the results you get in other GUI interfaces to ORACLE. Often these GUI interfaces introduce array fetch processing behind the scenes without you even knowing it. For instance SQL Developer by default will only bring back the first 50 rows and only retrieve more as you scroll through the result set. This makes it SEEM like the query ran fast when in reality it was fast bringing back 50 rows.
A more proper comparison would be to run the query in command line SQL*PLUS, which does no array fetch processing by default.
As Peter said, DEBUG MODE is one way of looking at the what is actually happen in APEX when the page loads. If you're familiar with 10046 SQL Trace files, you can produce one of these for the page rendering by appending '&P_TRACE=YES' to the end of the URL for your page. W
WARNING: If you're uninitiated, SQL Trace files are not for the faint of heart! Seek help from a DBA or Tuning Analyst...
Hope this helps
Doug Gault
www.sumneva.com

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              WLENCODED_BYTES_OK = false;
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              private final static String wlblock0 ="\n<center><h1>Hello World</h1></center>";
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              static private javelin.jsp.JspFunctionMapper jspxfnmap = javelin.jsp.JspFunctionMapper.getInstance();
              public void doTag() throws JspException, java.io.IOException {
              javax.servlet.jsp.PageContext pageContext = (javax.servlet.jsp.PageContext) getJspContext();
              javax.servlet.http.HttpServletRequest request = (javax.servlet.http.HttpServletRequest) pageContext.getRequest ();
              javax.servlet.http.HttpServletResponse response = (javax.servlet.http.HttpServletResponse) pageContext.getResponse();
              javax.servlet.http.HttpSession session = pageContext.getSession();
              javax.servlet.ServletContext application = pageContext.getServletContext();
              javax.servlet.ServletConfig config = pageContext.getServletConfig();
              javax.servlet.jsp.JspWriter out = jspContext.getOut();
              javax.servlet.jsp.tagext.JspTag _activeTag = null;
              try {
              {_writeText(response, out, _wl_block0, _wl_block0Bytes);}
              } catch ( Throwable t ){
              if( t instanceof javax.servlet.jsp.SkipPageException )
              {throw (javax.servlet.jsp.SkipPageException)t;}
              if( t instanceof java.io.IOException )
              {throw (java.io.IOException)t;}
              if( t instanceof IllegalStateException )
              {throw (IllegalStateException)t;}
              if( t instanceof javax.servlet.jsp.JspException )
              {throw (javax.servlet.jsp.JspException)t;}
              throw new javax.servlet.jsp.JspException(t);
              finally {
              ((javelin.jsp.JspContextWrapper)jspContext).syncEndTagFile();
              Edited by Stephen Davison at 04/11/2008 9:02 AM

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