outsanading behaviour in AXI Vs memory latency

I am trying to implement the axi outstanding feature in CPP, i tried to search if there is already a model in CPP, did not find alot. Is there such model ? If not, Is there any diff in terms of READ and WRITE when it comes to outstanding ?

In additional, what is the expectation to performance degregation when  having memory latency 10 with oustatnding of 16 aginst memory with 200 as first access latency and the secong access latency is 1, assuming b2b transactions.

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