Puppet users - Dec 2012 - Puppet 3.0.1: time spent fot "File" resource increased

After updating master from 2.7.12 to 3.0.1 I noticed, that agents began 
spending more time on  "File" resources, which I can see from
--summarize
output:
about 40-45 seconds now, and about 25-30  before update. 

What could cause this problem?

I also noticed, that "preferred_serialization_format = b64_zlib_yaml" 
doesn''t work anymore and "pson" is used by default, so could
the absence of
compression cause this problem ?

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