Acceleration issues?

I only see one catalytic converter on this car, here is the system so you can see for yourself. I can't see how replacing catalytic converter is a "temporary" fix? Does the car have any codes? Here is how you can test the cat by using this guide. Do you live in California, if so, you may have a catalytic converter where the exhaust manifold is in which case this would be the one I would change?

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

Here is a guide as well:

https://www.2carpros.com/articles/engine-has-low-power-output

I would run the codes as well.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

This should help us confirm the problem as well. Check out the images (below). Please let us know what happens.