Illustrator Running Slow on New Haswell CPU

Hi,
I Have come across a very strange issue.  After Upgrading a system for a client form an Ivy Bridge to Haswell Illustrator is running considerably slower.  The rig is the same as before we only changed CPU and Motherboard.
The Rig is
Windows 7 Pro x64
Gigabyte Z87X-UD5H (old board was Z77X-UD5H)
Intel i7 4770k (old cpu was a 3770K)
32GB DDR3 1600 Kingston.
Intel 530SSD
We are using the onboard Intel 4600 (before was the on board Intel 4000)
Both the Windows and Illustrator are all fresh installs and are all updated.
Does anyone have a thought?
Thanks.

Hi
I Have moved from Apple to WIndows 8.1 due to MBP 2011 GPU issues & Apple ignoring the issue.
Anyway the samsung is as follows:
NP870Z5G-X01
WIn 8.1 x64
16GB RAM 1600kingston
i7-4700HQ @ 2.4GHZ
Intel 4600 graphics / NVidia GT750M
The machine is 2 years newer than my old 17" MBP so should whizz through the tasks in illustrator but has the same problem, lagging when moving, also when zooming in and out. I noticed that the Nvidia card is not used in Illustrator just Photoshop. It really is slow though and painful to use.
I hope someone can sort it out soon.

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