Tomas Vondra <tomas.vondra@2ndquadrant.com> writes:
> over the past couple of weeks I've been running various benchmarks with
> the intent to demonstrate how the performance evolved since ~8.3. In
> most tests we're doing pretty good, but I've noticed that full-text
> search using GiST indexes is an annoying exception - it's getting slower
> and slower since ~9.1.
Hmmm... given that TS_execute is near the top, I wonder if this has
anything to do with the several times we've mostly-rewritten that
to make it less incorrect for phrase search cases. But that came in
in 9.6 IIRC, and the fixes have only been back-patched that far.
Don't know what might've changed in 9.3.
regards, tom lane