>> I did it. It is strange, so your times are significantly slower than I
>> have. Have you enabled asserts?
>
> The table contains 15 million rows with column values randomly
> selected from the 1-350 range, with 60% within the 1-50 range, and
> asserts are enabled.
>
Now I repeated tests on litlle bit wide table with 9 milion rows, but
without success.
Try to disable asserts. I am not sure, but maybe there significantlly
change a speed.
Pavel