3ds max 2014 - pflow, Speed by surface problem

[mktv]

Hi, 

I try to do water condensation on soda can.

Following Beso tutorial : https://vimeo.com/68285678 , but have problem with Speed by surface.

Problem is that when I switch Speed by surface to Control Speed Continuously playback is very slow.

No mather if it is 20 or 200 particle. I have seen some tutorial about condensation effect but no one had such a problem.I have fairly efficient computer(2xXeon 24 threads, 24Gb Ram).

The same problem is on HP820 (somilar configuration as my). Wher is the problem?

I`m working in 3ds max 2014 SP2.

Thanks, Maciek