Information iMac late 2015 with R9 M380 & HDD 1TB

[iMore Question]

Hi,
I've got a problem with user experience in daily use:
when I take any program in full screen I see slight lags in the animation.
I would to know if it was normal with the R9 M380.
someone else have the same problem?

Thank you
regards

 

[Just_Me_D]

I'm not aware of any, but I also don't have an iMac. How much RAM does it have?