What I have to say about version 13.4...

1) I'm mining on Nanopool since early feb, and I've never seen the average line so close to reported hashrate line as I'm seeing now.
2) Since version 11, I've started to get many invalid shares I wasn't getting before. Since 11.4, I haven't gotten any invalid/rejected share.
3) About increase on hashing... I was getting 341.9/342.2mh/s on 11.2. I am getting now a stable 342.8mh/s.

Great job!!