We are discussing about implementing some type of caching on Avatar but it won't be started before we are done with chunk transfer of HTML files implementation to make user feel faster response.
After taking a good look at our link substitution function, we did some changes and manage to make it about 10% faster.

We have a new build that capable of Chunked Transfer-Encoding. We still try to do more testing to make sure everything is OK before using it live on our server.