Lag/delay when switching between windows/applications in Yosemite

I have installed Yosemite onto a 27" iMac mid 2011 with 16Gb RAM. Since the installation anytime I switch between windows in an application or between applications I get a delay or lag of between 5-10 sec before I can then utilise then next window. I have 3 other iMacs of various ages that I have also installed Yosemite on and there has been no lag/delay issues. One of the other iMacs is exactly the same specification as the one that is displaying the lag/delay. It did not exist in 10.9.5.
Has anyone else encountered this issue?

Run some of the maintenance utilities such as Onyx, Cocktail or Main Menu.
Create a new user account and see if it is also happening there.

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Okay, I have found the problem.
Seems that I hadn't correctly enabled [email protected].
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ecologisto wrote:
Hi,
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Lag/delay when switching between windows/applications in Yosemite

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