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waziazi

macrumors regular
Original poster
Aug 3, 2018
144
107
USA
Has anyone experienced lag connecting 2 LG 4K displays to the 2018 13” MBP?
 
I don't know about 2, but one of the main reasons I returned my 2018 13" for a 15" was that the 13" was struggling to run my 32" LG 4k display. The overall smoothness of the machine would drop and when playing 4k youtube videos in fullscreen the videos seemed to be running at a really low frame rate, much lower than the videos original fps. With the 15" due to the dGPU I have not had such issues and everything is running as intended with the same monitor.
 
I don't know about 2, but one of the main reasons I returned my 2018 13" for a 15" was that the 13" was struggling to run my 32" LG 4k display. The overall smoothness of the machine would drop and when playing 4k youtube videos in fullscreen the videos seemed to be running at a really low frame rate, much lower than the videos original fps. With the 15" due to the dGPU I have not had such issues and everything is running as intended with the same monitor.

Weird. My 13" runs fine with a 27" IPS 4K screen attached.
 
I've used a 2016 13" MBP on the 27" LG UltraFine 5K Display with no problems.
 
I used them side by side and it was noticeable to me. Maybe my 13" had a problem or maybe 32" is pushing it to the max. Either way I did not experience this on my 15"
 
I have a 4K LG monitor with my new 13" and it's been working just fine. I'm using a Thunderbolt to DisplayPort cable.
 
Perhaps it works fine with the LG 4/5K displays specifically made for the MacBooks? Also when you say fine do you mean it works but there is still a drop in smoothness/FPS or it works perfectly smooth? No choppiness or lag in UI and videos?
 
I don't know about 2, but one of the main reasons I returned my 2018 13" for a 15" was that the 13" was struggling to run my 32" LG 4k display. The overall smoothness of the machine would drop and when playing 4k youtube videos in fullscreen the videos seemed to be running at a really low frame rate, much lower than the videos original fps. With the 15" due to the dGPU I have not had such issues and everything is running as intended with the same monitor.

This. I returned my 2018 MacBook Pro. Had it connected to a 5k display and more often than not, under decent load, the fans would constantly keep spinning and get real noisy.

Going back to my 15" 2017, the machine runs really smoothly with the fans never almost ever running under the same load. Can't bring myself to shell out 4k for a 2018 15" when I have my 2017 15" that works perfectly for my needs. I do have a 2017 12" MacBook which is my main portable machine so my 15" almost always stays docked to the LG 5k display at home.

Personally I think, Apple tried to squeeze more power from the current Mac's by increasing the cores, but the thing gets so hot that it cannot sustain it or the fans have to work overtime.
 
This. I returned my 2018 MacBook Pro. Had it connected to a 5k display and more often than not, under decent load, the fans would constantly keep spinning and get real noisy.

Going back to my 15" 2017, the machine runs really smoothly with the fans never almost ever running under the same load. Can't bring myself to shell out 4k for a 2018 15" when I have my 2017 15" that works perfectly for my needs. I do have a 2017 12" MacBook which is my main portable machine so my 15" almost always stays docked to the LG 5k display at home.

Personally I think, Apple tried to squeeze more power from the current Mac's by increasing the cores, but the thing gets so hot that it cannot sustain it or the fans have to work overtime.

Im glad im not the only one. I had no reason to lie and was literally using a 2018 15 and 13 side by side doing numerous stress tests and daily work flow testing to see which machine would work best for me. The 13" clearly was lagging and sluggish when connected to my 32" 4k display. Like I stated earlier, framrates in 4k youtube videos were horrendous to the point where I would have to play them back at 1080 and window size to get it to perform decently. People are quick to discredit your experiences just because they haven't experienced the same thing on completely different and older machines.
 
Im glad im not the only one. I had no reason to lie and was literally using a 2018 15 and 13 side by side doing numerous stress tests and daily work flow testing to see which machine would work best for me. The 13" clearly was lagging and sluggish when connected to my 32" 4k display. Like I stated earlier, framrates in 4k youtube videos were horrendous to the point where I would have to play them back at 1080 and window size to get it to perform decently. People are quick to discredit your experiences just because they haven't experienced the same thing on completely different and older machines.


Yea , everyone’s idea of load is different. For me it was being able to open 5-6 YouTube videos ( not playing all of them, just open a few and watch them one at a time) and run Xcode and a bunch of other apps, services running in the background etc.

My 2017 15” i7 runs smoothly. The 13” 2018 i7 just couldn’t handle that load. ( connected to a 5k display of course )
 
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Well that's super ******. Why does apple say it can support external displays when it can't?
 
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Hmm. It seems up to a single 4K display may be okay with the 13" 2018 for 4K video playbacks. Beyond that, eGPU is the way to go.

For productivity and software development workflows and up to 1080p videos, the 5K or even dual 4K shouldn't have much issue with 13" 2018 or would you still conclude 13" is still not good enough for external displays beyond single 4K?
[doublepost=1533724235][/doublepost]The following thread has an experience report on dual Dell 4Ks with 13" 2016:

https://forums.macrumors.com/threads/2018-mbp-13-and-dual-4k-monitors.2127534/
 
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