Crazy input lag in digital painting software

Hi,
at work I have a MacBook Air 13" Mid-2012 (CPU i5 1.8 GHz, SSD 128 GB, RAM 8 GB, OS X 10.8.5) connected to an external monitor (DELL ultrasharp). I tried to use this computer with some digital painting software (like Adobe Photoshop, Corel Painter and GIMP) via Wacom Intuos 4, but I have always the same problem: heavy input lag, I am not comfortable to paint anything with this lag. This problem occurs with mouse too (if I try to paint a long line with mouse the lag is still there); I do not have this problem under Windows 8 on another computer with my Wacom Intuos 4 (this means the problem is related to MacBook Air and/or Mountain Lion). Should I switch back to my old workstation with Windows?
Thx for any help
Paolo
P.S.
All drivers and software are updated, I tried SmoothMouse and similar software but the problem is still there.

Hi Kelmen,
"clicking mouse or keyboard will causing obvious lagging/short-hanging in game, like 1-2 seconds. if i move mouse it is ok. this will keep occuring for like 15-30 secs, after that, issue will gone."
According to my own experience ,it is a normal symptom .
During the booting process of the games ,there are many system resources occupied by the games.So it is reasonable ,we will come across a little lag issue.We can open the task manager to monitor the staus of the system resources .
To get a better performance of palying games ,we can try to disable the unnecessary autorun program to allocate the system resources for the game .
We can use the Autorun tool to achieve.
Autoruns for Windows v13.2
https://technet.microsoft.com/en-us/sysinternals/bb963902.aspx?f=255&MSPPError=-2147217396
To get a better performance ,it is recommended to keep the machine up to date .
We can try to manually update the driver for the mouse ,keyboard ,video card .It is recommended to download the latest driver from the manufacturer website for these devices.
Best regards
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