I was a bit confused about the read and write sorry ! I understand what you
mean...
But do you think that the IO cost (of only one page) needed to handle the
index writing is superior than 300ms ? Because each insert in any of these
tables is that slow.
NB: between my "small" and my "big" tests the only difference is the number
of table (10 and 3000), there is almost the same amount of on-disk data