SupraTT , if you are referring to nano-clones, seems that many 4GB Actions chipset players are having the slow navigation problem. It could that the processor is trying to access a large volume of memory.
On the other hand, if you had a larger budget, you could try the Meizu or Teclast players. They are definitely faster in navigation, and has better functions than the nano-clones. Besides, they come in 1,2,4,8GB versions.