Question System lags when second monitor is enabled

JSTQ

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Dec 17, 2013
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I just use browser and watch youtube video on second monitor. Firefox, tried to disable hardware accel, no difference, actually looks like became even worse.
Video looks like 15-20 fps-ish even though it plays flawless when one monitor enabled. Every app that is open lags if it has any kind of animations. When I scroll page in browser I get crazy horizontal tearing. Animation of opening chat window in a very low system reqs game is laggy. Using explorer I notice lags. Skype is laggy. Its practically impossible to draw in photoshop because the lags are insane

Enabling vsync for browser in driver didnt helped

What I noticed is that discord isnt laggy at all

CPU load stays at around 7-20%
Ram available: 10 GB
GPU load & Mem controller load - 20%
Video engine load - 0%

My specs:
Windows 7 Ultimate x64 SP1 on Samsung 850 EVO 250 GB
PSU CoolerMaster MasterWatt Lite 600W
Monitors: Asus PB278Q 2.5K 60 hz connected with display port + Samsung SyncMaster XL2370 1080P 60 hz connected with DVI
ASUS Z87-K, Intel Core i7-4770K@def clock (Scythe Ninja 3 Rev B + Arctic Cooling MX-4)
DDR3 8GB Corsair XMS CMX16GX3M2A1333C9 + 8GB Kingston ValueRAM KVR16N11/8
Palit GTX 1060 3 GB DUAL [NE51060015F9-1061D]
ASUS XONAR ESSENCE STX
Hitachi HDS5C3020ALA 2TB + Seagate Barracuda ST2000VX000 2 TB + Toshiba P300 3TB
 
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