Octave 6.1 issue

Hi, I've been working on a large optimization project (several hundred
lines of code in multiple files spread over a main  directory  (folder) and
several sub-directories). Have been making good progress with the work in
Octave 5.2. Typical optimization runs take 6 to 12 hr on a Windows 10
computer with an AMD Ryzen 9 3900X processor and plenty of RAM, with each
iteration of the optimization taking about 25 - 30 seconds. A typical
optimization run can involve 300 to over 1000 iterations of the main
program.

I recently installed Octave 6.1 on the same computer. The optimization
runs identically, initially. But with time, the duration of each iteration
starts to increase. After a couple of hundred iterations, each iteration is
taking over a minute. This does not happen in Octave 5.2 - the iteration
time stays the same until the optimization run completes.

I'm using fminsearch, but I have adapted fminsearcbnd from the MATLAB user
library. This allows me to specify bounds for the parameters being varied,
which is important for my problem. So I call fminsearchbnd, which in turn
calls fminsearch.

The code is too large to post here but I thought I should bring this to the
attention of the developers. Happy to help if there is something I can do.

- Rory Conolly