I would suspect some sort of air lock in the pipe, or just a partial blockage which is slowing the water flow.
You may be able to clear it using a rubber plunger. You need a plunger that has a metal or hard plastic disk fitted above the rubber cup (to prevent the cup turning inside out).
If you have an ordinary plunger without the disk you could probably make one to fit it - perhaps the bottom cut out of a plastic drinks bottle and a hose clip to hold it in place.
You will need to work the plunger quite vigorously up and down in the toilet bowl to force a pulse of water through the system.
Pouring a large bucket full of water down the toilet after plunging may have more impact than just normal flushing. It will also refill the trap.
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