Plumbing - toilet tank not filling?

Hello. I am having an issue with a Kohler toilet. The bowl fills pretty high but the tank takes about 4 minutes to fill high enough to raise the float and turn the water off. The water pressure is very strong so that is not the issue and the rubber flap is brand new. Let me know if you need more info since i'm... show more Hello. I am having an issue with a Kohler toilet. The bowl fills pretty high but the tank takes about 4 minutes to fill high enough to raise the float and turn the water off. The water pressure is very strong so that is not the issue and the rubber flap is brand new. Let me know if you need more info since i'm not sure what else to describe. thanks!
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