I had an opportunity this week to remember my days of engineering where I sit for hours (more nights) to device under test (DUT) and performance testing tools such as Spirent IXIA or wait and try the ports of the recovery test tool to initialize config to download, test, and test to initialize. Later realized that you forgot some config on the DUT or on the tool and restart all the time-consuming procedures all over again. God thank you for a very patient team with great reconfiguration NetScaler If when needed. He also contributed to ask various experts (SMEs) to see which settings may be missing, etc. on NetScaler and 3rd party testing tools. And through this process, there is a knowledge base (KB) CTX127237 as an engineer NetScaler DevTest wrote some time which gives some details on specific configurations that NetScaler can be of use. Some of these tips can be for the SSL configuration, capacity testing, compression, concurrent TCP connection and some others specifically for Ixia test tool.
Very good article that is available for Citrix Sales / SE to use. Do not hesitate to contact your Citrix representative for some of these tips if needed.
In addition to the advice of NetScaler, I also learned that the third party models have improved tremendously since I worked on these tools. Some even have specific performance models such as L7 HTTP RPS, L4 CPS, etc. So it's certainly good to look for existing models that might already be available for your existing performance testing tools. It was also useful to work with 3rd party representative tool to get the last maximum or limitations on certain modules or chassis used in particular for HTTP 1.0, HTTP 1.1, IPv4, IPv6, etc. For example, for one of the tests has forced us to make maximum concurrent TCP connection, but we continue to hit the maximum 10M 15M instead of that we expected this test. We later learned that the maximum in a single card is 10M, hence the need to make 2 cards for this test.
At the end of the test suite that had to run in front of a client, of course NetScaler Rocks !! 
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