Does foil slow down cooking time?

Chef's answer
But yes, foil deflects/defuses heat. ... And for some foods, especially something like salmon, the DRY heat is what you want to get the best results. Generally you only want to use foil if you're trying to keep part of the dish from cooking quickly or if you're trying to prevent browning/burning..
Frequently asked Questions 🎓
How to rest the meat. Take it from the heat and place it on a warm plate or serving platter. Cover the meat loosely with foil. If you cover it tightly with the foil or wrap it in foil, you will make the hot meat sweat and lose the valuable moisture you are trying to keep in the meat..
If you need to cover something in the oven you can use a baking sheet, metal lid, parchment paper, silicone lid, or a silicone mat instead of aluminum foil. Dutch ovens with lids, stoneware, CorningWare, and enamelware are all baking and storage solutions with lids.
Wrapping Meats To properly rest meats after cooking, you must wrap them. After a cut of meat is finished cooking, gently wrap it with aluminum foil in a tent-like fashion. This will keep the meat warm after it reaches its peak internal temperature while resting.
Cook Them on Wrinkled Foil By crumpling the foil you allow for better air circulation as the ridges form little airways for the heat to travel through. The better the heat circulates, the crispier you fries will be. This method can be used for a myriad of foods like bacon, pizza, chicken nuggets, and more bacon.
Wrapping the meat in foil will limit the amount of smoke on the surface of the meat thus yielding a better color and flavor on the final product. It also adds moisture and speeds up cooking time. Wrapping should be done about half way through the cooking process or when internal meat temp is 150-160 degrees..
Yes, you can put aluminum foil in an air fryer.
End colds! Just wrap your feet in 5-7 sheets of aluminum foil and leave it like that for about 1 hour. The paper has anti-inflammatory properties and can help you alleviate some of the symptoms of a cold. Let your feet breathe for 2 hours and repeat the process. You will notice improvement in a couple of days.
A few more cooking questions 📍