BetterSnapTool causes interface’s lag on Mac OS Yosemite

I had a bug that driving me crazy whole year that I upgraded to Mac OS Yosemite. During the working day my Macbook air’s interface became veeery laggy. Only restart helps.

Turned out that BetterSnapTool was the cause of the lag. I’ve closed it and suddenly everything works fine.

Still this program was very helpful, so I’m using now it’s free and open-source alternative — spectacle.