Slow scroll

The problem is that when I scroll a source code file in PyCharm I see how it is being redrawn line be line. It should not be like this, because in other applications I scroll and see no such effects.

My configuration is:
$ uname -a
Linux dmugtasimov 3.2.0-23-generic #36-Ubuntu SMP Tue Apr 10 20:39:51 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
$ cat /etc/issue
Linux Mint 13 Maya \n \l

PyCharm 2.5.2
Build #PY-117.663
Built on June 29, 2012

JDK 1.7.0_06
VM: Java HotSpot(TM) 64-Bit Server VM
Vendor: Oracle Corporation

Gnome

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