Have you had any luck solving SoapUI memory issues? I've been having these issues ever since using SoapUI. It seems to just hold on to memory throughout the test case no matter what I do (disable transaction log, groovy script to clear cache). It's a huge issue to have while running large or complex test cases, and SmartBear seems be be doing nothing to solve it.
At least when you advertise your product, let potential customers know of these huge limitations to your software. And before someone links me to the "Improve memory usage" page, I've already done all of those things, and it still build memory up throughout the whole test case, quickly going from 1GB to 12GB and failing to continue due to max heap size error. My company will definitely be looking into other options for API testing if this glaring and significant issue can't be addressed.