I am afraid that the performance of JustMock is not improved significantly. The main reason for this is the call from the CLR to JustMock profiler for every executed method.
Nevertheless, we will continue looking for opportunities for improving the performance.
I am not sure if this is an option in your scenario but you could add more virtual or physical machines to your CI. This way when a build is triggered it will be executed on the next free machine and the builds won't pile up and of course, the result of each build would be known faster.
I will be happy to answer any further questions you may have.
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