Display interface lag on 4k DELL P2715Q monitor MacBook Pro Retina, 15-inch, Mid 2015

Though the post is a bit old, I have the exact same monitor and just found, that using scaled resolutions with a 13" MBP (early 2015) causes serious performance issues. Just use 1080p or 2160p. That [^almost] solves the problem for me.

Hope this helps.

Jonas

[^almost]: animations are smooth now, but there's somtimes a short "thinking break" before animation starts.

Remove the worthless Norton/Symantec product temporarily by following these instructions. If you have a different version of the product, the procedure may be different.

Back up all data before making any changes. If the problem is resolved after the uninstallation, notify the IT staff that their mistaken security policy is the cause.

I have a similar question: I am strongly considering buying a P2715Q for my new MacBook Pro with retina display (16GB mid 2014 model with 2.2 GHz Core i7 processor, Intel Iris Pro 1536 MB graphics). Were the display issues on the newer one because of the Norton software?

Otherwise I was considering going with a Dell U2715H.

I just got a samsung 4K screen and I have the same problem (new mid 2015 macbook pro 15"). It's very hard to work like this, the whole GUI is just slow. I don't think there is anything to do but to wait for a fix from Apple.

Well, after a nice talk with Apple support reset SMC solved the problem:

Resetting the System Management Controller (SMC) on your Mac - Apple Support

I can now work normally with by big 4K screen!

Ok so that helped for a bit and then the slowness returned. Apparently there is a known issue in Yosemite which only resolved in El Capitan OS X 10.11. Until then, you can use the Increase contrast option in the Accessibility menu which helps quite a bit.

I'm glad I finally found your post! I have this same monitor and have been searching for weeks to find a solution to this lag.

I have a program from the App Store called Display Menu and it has every resolution and Hz rate. Anything past 1920 x 1080 drops down to 30 Hz.

I have a brand new Mac Pro and I know this thing can push 4K 60 @ Hz. Disappointing that we'll have to wait for the fix.

I'll follow here and post any quick fixes I find!

Hey,

Well since my post I've went out and bought mini DP to DP cable and things have considerably improved. HDMI is limited to 30Hz, and I know that, but what I did not know is how much of a difference the DP cable will make. Now it's like looking at completely different screen, smooth, clear and crispy. So yeah now I am using the DP cable at 3840x2160@60Hz and with the Increase contrast option checked on in the Accessibility menu it's very smooth and responsive.

Good luck!

I was very glad to see this last post from you because I'm buying your exact MacBook Pro, the maxed out 2015 15". I too have recently learned that HDMI is horrible, Display Port is way better.

Great tip on playing with the contrast! My dell P2715Q also runs distrupted on the new mac pro. Playing with the contrast helps quite a bit.

I guess we will have to wait for the El Capitan to fully utilize potential of this display.

Hi,

I have this exact same issue. I just bought the top end 15" MBP and the dell display and am having the same horrible performance. Do you mean that you are running the display out of the HDMI port on your computer and converting it to mDP? Could you share what your exact cable and set up is? If you're able to get smooth performance at 60Hz then whatever you're doing seems like it might be a viable workaround for now. Definitely wondering if this is just going to require a fix from Apple to support the display.

Cheers!

Hi MRusczyk, I have the same issue. Did you ever find a resolution? Would be great if you could share, really frustrated by this problem. Cheers!

.

SO did anyone solve this? I have a MBP 15 retina 2015 and there's only HDMI and 2 Thunderbolt ports, so what cable do I get to plug into Dell p2415q? I'm experiencing huge lag when I use Adobe CC apps on the Dell.