Could plugging a dishwasher into an outlet cause it to not dry as well?
If your circuit breaker isn't tripping when the old or new dishwasher ran a full cycle, then hardwiring won't change a single thing. Check that your drain hose is clear &amp; run up to above the sink trap or underside of the countertop.

There should be quite a forceful stream of water visible in the garbage disposal or sink drain. If not &amp; you have an Air Gap atop the sink, then take the cap off the Air gap (dishwasher off) &amp; clear all debris. You'll need to snake something down the hose leading into the garbage disposal or sink drain until you can see it come out in either. Correct any hose under the sink to be as inclined as possible above it's connection so future flow-back is eliminated.

And, especially check that the bottom of the dishwasher's inside grate or strainer is clear...if clear glass ever broke in there you really won't notice it blocking the water exit. Also, if you wash food product jars without completely removing labels, they will gum up the works quite badly &amp; quickly.

All this should get you back in tip top shape. A new dishwasher doesn't fix an old or worsening clog.