The february update it now available. It’s about 5% faster in mean, up to 10% on top of the existing speedup. It also has a new option to reduce noise, allowing to render about 20% faster for the same noise level. The original idea is from solid angle, the implementation from Lukas Stockner, updated and fixed by @Dragon.Studio and me.
Here an example of architecture fly through. 1min54 per frame at full resolution 
Original scene from Evermotion. So it works perfectly with animations, even with complex light path through glass.
You can get the 2.8x or 2.7x version until this midnight UTC+1 time at reduced price. If you prefer smaller rates, you can get 2.8x here.
As usual, if you find any bug, you can send me a file to reproduce per Email or PM and I’ll have a look.