Macbook pro 15 retina with UHD display slowness

I have connected a
Samsung display U28D590, to my Mid-2014 MBP 15 Retina with Intel Iris Pro.
My display reports a successful 60hz and is set on DispalyPort 1.2 protocol.
But still when the extra display is connected i experience hiccups, like it gets stuck and i can not move the mouse for a few seconds, sometimes even 10-20 seconds and the keyboard as well at times stops reacting, the system freezes, i think that music playback continues if exists.
i am aware to :
Using 4K displays and Ultra HD TVs with Mac computers - Apple Support
i am not sure about the effect of:
Intel-based Macs: Resetting the System Management Controller (SMC) - Apple Support
and i even tried:
How to Reset NVRAM on your Mac - Apple Support
i want to know if this is the best results i can get, i would love to hear from users with the same expirience, and also if having the dedicated video card
another interesting thing to note is when i go full screen, in youtube, mac gets hot, but when i play a video from my ssd with vlc and put it full screen it doesn't necesserially happen, and i can watch 2 hours without any fan noise. running the cpu hot for long period as a movie is not recommended if i am not wrong. but most important are the long hiccups.
please help me! thanks in advance.

hi happy,
thank your for you answer. maybe it is the Safari Browser when i hover an Link sometimes it flicker.
this morning

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