long merge

Hi there. I have merged one file for about 27KB from one branch to another
and i wonder why that process takes so long and takes about 10 MB
transferred?
See below:
https://drive.google.com/file/d/0B4mLkzBXmYycdUMwdzB0aGdkMnM/view?usp=sharing

ver. info
TortoiseSVN 1.7.13, Build 24257 - 64 Bit , 2013/06/01 07:32:54
Subversion 1.7.10,
apr 1.4.6
apr-utils 1.3.12
neon 0.29.6
OpenSSL 1.0.1e 11 Feb 2013
zlib 1.2.7

-- 
Kind regards,
Sergey Ivanov
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