>threads. So, this breaks myth that inserts (to one table) can be speed
>up by splitting it to different threads
>4. FB 2.5 SS - 32 threads are 3 times slower than 1 thread

That is a strange result, I assume that you did the tests on a fast hard drive? I've made my tests on SSD.
My threads were operating on a short transactions, 100 record per transaction.

>seems that this is related to your application, how you deal with
>connections and threads in it. Our tests had no any "unstability" even
>at 32 threads.

I doubt it because it works without any problems on 2.5 SS. But it does not surprise me that your tests are passing because you have a different application with different performance results.

Best regards.