APEX vs Forms 6i - Processor/System/Network Overhead

We have been developing and deploying applications using Forms 6i for some years, have moved to web forms and are now developing in APEX. The IT department of client of ours has asked us to provide the relative performance merits and impact on CPU performance for each of the three technologies with particular focus on the server on which the Oracle database is running, in order to determine a basis for charging.
Assuming that the application is the same. i.e. There is a common set of PL/SQL commands across the deployment technologies. Would it be true to say that this would be relatively the same for Forms and Web Forms, since these are generally deployed with separate forms or application servers, but would be higher for APEX, since APEX PL/SQL commands are required to build web pages before being sent (in this case) to the Oracle HTTP server? If so, are there any figures available to substantiate this case?
Taking this one step further. Given that there is a network overhead for each of the deployments (in addition to the database overhead) has anyone conducted an analysis on the relative efficiencies of the three in presenting the same content? Or any insight as to what that might be? This could potentially be offset against an increase in datbase server cycles, if the former is true.
Thanks very much for your help.
Regards, Malcolm

This will be hard to quantify without running your own tests, but based on feedback from other customers, the server resources required for APEX are somewhere in the neighborhood of 1/3 to 1/10 that required for Forms. This is especially true for memory, since every Forms client requires a dedicated server connection whereas APEX uses connection pooling. So, lets say you have 1,000 Forms users with an average memory requirement of 5mb per client (just guessing here), that's 4.8gb of RAM just for client connections. The typical number of sessions in that size APEX deployment is 10-20 = 50-100mb of RAM for client connections. The CPU impact of rendering APEX pages is VERY insignificant compared to the CPU required for most of the queries your developers will write. One of the busiest internal APEX instances has over 200,000 page views per day and is a 4 processor machine.
Regarding network traffic, I'm not sure but you could measure the Forms traffic with Wireshark. You can probably estimate your average page view for an APEX to be somewhere between 35 and 50kb excluding CSS, JavaScript, and Images which should only need to load on the first page view. I highly doubt either client-server forms or web forms are less than that.
Thanks,
Tyler

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APEX vs Forms 6i - Processor/System/Network Overhead

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