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As an afterthought, of the vent going to the roof is blocked from little critters making a nest, with water in the bowl, you will create a vacuum and the flow will be slow. You can easily check to see if it is a vacuum. Turn off the water to the system, including the internal pump and have someone open the toilet drain when you dump. If there was a vacuum, the toilet being open will relieve that pressure and the flow should go fast. I would then suspect the vent to the roof.
Lots of luck.
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