If this is a new thing in your life? Has anything else changed, recently? Do you simply have the time to eat slowly? Have food-thieves been removed? (Friends, family, housemates, pets, etc.). Is your anxiety up, making it difficult to swallow, or dry mouth, or making you feel nauseous or like you ate a brick if you eat too quickly? Is your disassociation kicking in and you're zoning out whilst eating? Any big changes -or stressors- that might be kicking in a control issue that's expressing in disordered eating? Can you taste the food you're eating? (Anhedonia). Or like/not like it? Dealing with any kind of depression?
^^^
There's a whole lot of factors that can affect eating speed. Those are just a few off the top of my head.