The answer to 'why is my garbage disposal slow draining' is that a clogged or jammed garbage disposal is the most common cause. This can happen when the disposal is overloaded with food waste, or when debris and buildup accumulate over time. A slow drain can also be caused by a problem with the plumbing pipes connected to the disposal.
Some common symptoms of a slow-draining garbage disposal include water backing up in the sink, gurgling sounds, or a disposal that runs but doesn't fully clear the drain. To fix the issue, you'll need to clear the clog or remove any jams in the disposal. If the problem persists, there may be a deeper issue with the plumbing that requires a professional plumber.