Uninstall RADEON driver - increased performance in 2D old GDI on the classic theme Windows 7.
This is not a joke - it works so badly AMD driver. Drawing time with Radeon driver is 140 ms and without driver 20 ms.
Increment in 7 times on "software" rendering of Windows, in comparison with "hardware" acceleration AMD driver.
If the ACC is Disabled, then download - http://ge.tt/8UaRx5q2