Unless totally plugged or if the honeycomb has shattered and is obstructing the flow you won't notice a cat holding you back. The little bit of restriction they could potentially have....isn't enough to sneeze at. If you are getting hesitation or feelings of sluggish acceleration you should likely be looking else where. A cat could hold you back if you are feeling it die out or become restricted in that 6-7 thousand RPM range with an engine built to exceed the engineered flow abilities of a stock exhaust. In all likelihood the muffler would be restricting you more than a cat converter.
Jeeps generally operate at revs below 4000 and with the small displacement they have..that isn't much flow. We aren't talking about a 454 @ 8000 rpm. For 99% of the Jeeps you see on the road...a 1.5 inch exhaust would handle everything they can flow. The cubic feet per minute just isn't there. Keep in mind that they are a displacement that is less than the smallest V8....and you can run those just fine with a y pipe and 2 inch exhaust to produce enough power to shred an inline 4 or 6.
If the hesitation is at the low end of the power curve you might be better off finding out about lack of fuel flow, mixture issues, ignition issues, timing problems, etc. I personally had some hesitation when transitioning to full throttle and it was the intake temperature sensor. It had failed and was telling the engine it was 100F all the time. It warmed up funny...and was not able to mix correctly. It is a $20 part.
I have in my time.....seen a guy that looks like me
hollow out a few cats...looking for improved flow. In my experience it does a whole lot of nothing. Not much change in sound...and negligible increases if any in power. Most the hype about cat restriction was generated by older gents...that first saw cats appear on 70's vehicles and automatically assumed as I did..that they were a source of restriction. Unless shattered to a point that they rattle like a can full of rocks...they aren't. If you can see thru them...they are fine generally. If you were pouring enough raw gas to get the cat to coke up....you would be getting mileage in single digits...and your exhaust would smell like sulfur / raw gas.
Just some thoughts....ymmv.