Tank fill is fine.
Water swirls round and round when flushed.
Most stuff goes down.
Then it backwashes the last bit of water (and whatever is riding the
surf at that moment)
Doesn't seem like a clog. Or is it?
Has it just started being sentimental? If it has always been this way,
consider holding down the handle just a little longer. Most new toilets
have regular and heavy duty flush. You get the heavy duty one by holding the
handle down longer.
If it just started, did it just get colder in your area. It seems some
people are having problems with the vents being blocked by frost.
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