How can i preload some textures in memory to avoid temporal lag in unity3d?
Yes, You could. When you say images I think you mean Materials. Try to implement the concept of Pooling.
If you are not aware of pooling, there are a lot of tutorials and help info on answers & on forums. The best tutorial to me, I could find was these two videos from Prime31. Though they do not say it in the title, they converse mostly about it.
I will try it on monday. Was sick and skipped work. Thanks for the help!