Using dependency properties inside the model

Question

I am currently developing a program for drawing graphs using WPF and C#.
I have model classes representing Vertices and Edges, also i have created custom controls to represent these model classes inside the View (on canvas like ellipse and line)
I am linking my models with the view using Binding. I have make the model classes inherit from Dependency object and make my properties Dependency properties in order to improve the performance and the notification between model( which is the view model at the same time) and view .so should i keep them like this (the model is dependency objects) which will keep the performance at top levels or make the model classes separated from the view completely and use INotifyPropertyChanged (but i will lose performance "About 30%")