I feel like the opposite would happen, and it would end up superheating the pizza. Then again, the deliveries may be a short distance, so it may not have that much of an effect on it, especially if they are in a delivery bag.
Flash fact: The speedforce can and will protect most things I am holding or carrying from my running. How else do you think I can carry people out of burning buildings so fast without their internal organs just collapsing?
That's true. However, you forget that this is spider man. when in any of his comics and the movies have we ever seen him spray non sticky webbing?(unless of course, he developed non sticky webing for this specific job)
If it super heated it too much however, it risks the possibility of over cooking and burning the pizza. At least id think so.