Safari CSS3/JS lags on iMac 2014

Hello guys,
I have few days old iMac 21" with nVidia card so I suppose my problem is about Safari and its speed
on my website www.davidsalcer.cz
is CSS/JS picture slider.
Nothing is wrong, on my late 2010 MacbookPro is works just perfect and fast, on other browsers Chrome and Firefox just fine too.
On other devices including iPhone 5 its also good even on win.
But today when I was checking on my website I realized that the picture presentation is "laggy", and I dont know why.
it seems that this problem is only on my iMac's latest Safari (but on Macbook the safari is also latest)
And the biggest confusing moment is when yesterday it was fine and this morning it all started to lagg. I didnt update the website nor the Safari, nothing.
I'm confused why the **** is this happening.
Do you have any thoughts about this?
Thank you for your time

Hi andyBall,
Looks like your suggestion did the trick. Fingers crossed, have left Safari running on and hopefully should be OK.
Once agaain many thanks to all of you who suggested options.

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