When the getblocktemplate latency started to appear, my efficiency was still between 110-115%. My getblocktemplate latency was about 30 seconds at that time.
This is the worst latency I've seen reported so far
My getblocktemplate latency hit about 30 seconds until I upgraded to the 0.8.2rc3.
Now I'm not sure if it's "bad luck" or something else but since I upgraded my latency is ~0.4 but my efficiency has been sitting in the low 80%s. I'm not quite sure how to debug this. My local DOA is ~2.5% but my orphans have been awful. I have both 8333 and 9333 traffic QOS'd. I guess I'm going to look closer at my network.