Optimize the following Python program to run faster.
def remove_duplicates(lst):
  s = set()
  for item in lst:
    if item in s:
      pass
    else:
      s.add(item)
  return s

lst = [1, 2, 4, 2, 5, 6, 3, 3]
new_list = remove_duplicates(lst)
print(new_list)
def remove_duplicates(lst):
  return list(set(lst))

lst = [1, 2, 4, 2, 5, 6, 3, 3]
new_list = remove_duplicates(lst)
print(new_list)