Just had my catalytic converter replaced now my check engine light is on

It’s rather unusual for catalytic converters to become “plugged” on these vehicles - it was a problem some years ago - mostly with domestic vehicles.. However It IS common for the catalyst to become depleted and is no longer functioning effectively which will induce trouble code PO420 - that isn’t what’s causing your “bogging down” concern. I strongly suspect there is another problem causing lack of power from the engine.. The only way to discover that problem is via *hands-on* testing by qualified personnel. (Without having the code here numbers it’s merely a guessing game!) Good luck!