Check and make sure the flush ring and the toilet blow hole are open make sure these holes are clear of hard water build-up
Is there any blueing tablets in the tank?
Remove any bluing cake drop-ins, these are a #1 cause to plug up the toilet flush ring.
Is the tank flapper staying up long enough?
If it tends to drop to fast, replace the tank flapper.
Is Tank fill valve operating ok?
You should have good water flow though this, including the bowl fill tube, this is the tube that comes from the tank fill valve to the overflow on the flush valve
This is the most important part of the toilet, if this is not working right you will have problems with it flushing good.
Is it plugged up?
There could be a foreign object inside the trap of the toilet, try a plunger or toilet auger, to clear or remove such object.
Toilet flushes slow raises to top then goes out slowly and water comes up in the tub or shower?
This indicates the mainline is clogged up, you will need to have the line cleaned out.
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