Thank you for looking into it too.
I will not look further into this because at this level of concurrency, using a Mutex is not a good solution. It was just a dummy speed test.
Would you mind run my project juste once to see if you have the same issue ? If yes I’ll upload it to github this week.
Edit: problem disapeared when upgrading to CubDB 0.13, even though reading the changes I cannot guess why.
