Horizontal scrolling faster than Vertical scrolling

I have a jscrollpane, containing a jtable as its component view. When i drag the vertical scroll bar, the painting is slower than when i drag the horizontal scrollbar. I've tried using a profiler to understand, but i didn't.
Can anybody help me ?

Horizontal scrolling:
.java.awt.EventQueue.dispatchEvent(AWTEvent) 100%
...java.awt.Component.dispatchEvent(AWTEvent) 100%
...java.awt.event.InvocationEvent.dispatch() 0%
Vertical scrolling:
.java.awt.EventQueue.dispatchEvent(AWTEvent) 100
...java.awt.event.InvocationEvent.dispatch() 77%
...java.awt.Component.dispatchEvent(AWTEvent) 22%
the invocatonEvent.dispatch() method call (through several methods) javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(JComponent, Image, Graphics, int, int, int, int).
In horizontal scroll (fast), this method calls sun.java2d.SunGraphics2D.drawImage(Image, int, int, ImageObserver)
In vertical scroll (slow), this method calls javax.swing.JComponent.paintToOffscreen(Graphics, int, int, int, int, int, int)
So i would say that the horizontal scroll calls repaint AFTER some offscreen image buffer is calculated while, the vertical scroll fails to do that.

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