AS Toilet takes a long time to flush and flushes very slow.

Perhaps it is taking a long time to fill the cistern, take top off and see if it's filling after flushing, if it's slow and pressure is ok it is likely to need a new diaphragm in the filling valve.

I wrote a tip that might apply to your situation:
http://www.fixya.com/support/r6633961-toilet_doesnt_flush_water_just_spins

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Sorry to read about your problem, I hope this helps you out.

i dont think you have toilet issue,

Try this. take a large bucket, like a paint or home depot orange bucket. fill 1/2 way...
put some toilet paper in the toilet. Then pour the water in fast, and see how it flushes. it it does a easy flush then your drain is ok. if its slow, you have a drain issue and not the toilet.

if that the case, then goto the toilet, and clean out all of the little holes, that are around the unit.. where you see the water come out. they can be clogged up. a small type wire like a clothes hanger.

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The amount of water in any toilet bowl is determined by its construction and no tank adjustment will ever change that. American Standard has a history of having small water surface areas in their low or ultra low flush toilets. Take a large container of water and pour directly into the bowl. If the ending level remains the same, then that is the manufactured level for your toilet.

Not all tanks completely discharge all of the water when flushed. Measure 1.5 gallons of water into a container. Turn off your water supply to the toilet then flush normally. Replace the water in the tank with your premeasured amount and observe this new water level. You might be surprised to find it is at the same level it always is. Since water weighs more than 8 pounds per gallon, one concept used in todays toilets is to have more than 1.5 gallons of water in the tank and use the extra weight push the water past the flapper at a faster rate while designing the flapper to drop after only 1.5 gallons have passed through.

Buy a fluidmaster flush fixer complete kit. about 20.00 or so includes flush valve, flush flapper, tank bolts flush handle. Follow directions

Check the following: Is the water level in the tank properly set? Is the flapper valve opening fully when flushed? And is there any blockage in the waste line? Use a plunger to try and clear the line if the first two items are OK.

new quality flush valves are inexpensive. suggest you buy a new one at a big box store (Lowe's e.g.) . easy to install, just follow the directions.....a Fluid Master or Gorkie should work fine...$25 or less, probably less.....

it sounds to me like depending on the flapper installed that your flush arm chain is too long and the flapper is not flipping back far enough to do its job. Take the lid off the tank and rotate the flapper up and back to see if it flushes correctly. if it does then your chain is too long and should be shortened. Hope this helps please rate me