Premiere Pro file is lagging after export

I should start off by saying I am not using pre shot footage in this file, its more of an animation using different angles of 3D objects. Essentailly a stop motion with PNG's and animated text. I do this method all the time for marketing conent at my company and it has never posed an issue. The frame rate is consitent between the source and the output so I am puzzeled. The video looks fine on the time line but after export it lags alot. Does anyone know what is going on here?