Performance nightmare

22 to 0.3 seconds!

I found a simple solution to a very common problem. While profiling I found that remove in this little method took a lot of the time.

   public void MovePropertyFirst(IProperty property)
   {
      properties.Remove(property);
      properties.Insert(0, property);
   }

The reason was, that it's time consuming to compare the properties by equality, for complex types. I think that in most(?) cases we want to delete the very same instance we supply as parameter to the remove method.

So I implemented a ReferenceEquals based remove, and by that I cut the time spent in remove by about 72 times!

public static bool RemoveFrom<T>(this IList<T> list, T itemToRemove)
{
  if(list.Count == 0)
    return false;
  int index = 0;
    foreach (var item in list)
    {
      if (ReferenceEquals(item, itemToRemove))
      {
        list.RemoveAt(index);
        return true;
      }
      index++;
    }
    Debug.Assert(false, "Item to delete not found");
    //equality based fall back
    return list.Remove(itemToRemove);
}