[erlang-questions] R11B-5 vs R12B-1: Win32 CPU Usage?

[Jan Jacobs]

Yesterday I decided to change from R11B-1 to R12B-1 and had the following
issues:
1) erl_interface libraries requires Visual Studio 2005 (Not documented at 
all)
2) R12B-1 consumes more CPU time than R11B-1.

Issue 1)
This is not documented at all.  It should be part of potential 
incompatibilities!
I can live with it, but it would have been nice to know it before I decided 
to upgrade!

Issue 2)
Application compiled with R11B-5 and using R11B-5 runtime I get CPU usage 
when testing of 16%.
Application recompile with R12B-1 and using R12B-1 runtime I get CPU usage 
when testing of 35%.


The OS and Hardware is the same for both instances, just the runtime the 
changes!
I have swapped the runtimes a couple of times to make sure it is not a 
fluke, the results remain the same R12B-1 is heavier than R11B-5!

OS: Windows XP Professional
HW: Pentium 4 3Ghz and 2G  Ram

Comparative CPU usage for same application on same HW and OS:
R12B-1: 35% CPU
R11B-5: 16% CPU

Have any one noticed something like this?

Cheers
Jan