Question Minecraft runs bad on on vega 11 , Ryzen 5 2400G

Valicious_

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Nov 12, 2015
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https://www.userbenchmark.com/UserRun/16619377
CPU: Ryzen 5 2400G
Motherboard: MSI B450M PRO-M2 (MS-7B84)
Ram: G.SKILL Ripjaws V DDR4 2666 C15 2x8GB
SSD/HDD: WD Green 240GB SSD , WD Green 2TB HDD
GPU: Vega 11, igpu (currently on 19.4.3)
PSU: Super Flower Bronze FX 450W 80 Plus Bronze
OS: Windows 10 64bit (Last Updated 30-04-19)

Everything works as what is expected from these specs, both games and other software, but Minecraft seems to be the odd one out.

In reference to 1.14 (this was also a problem in 1.12 and 1.13) i get 30 to 120 fps the whole time. It's stuttering most of the time and more often than not I get these lag spikes where the frames just says no. Chunk loading speed is abysmal and chunk glitches happen too often(this is probably just a Minecraft thing...).
(Vanilla Minecraft video: fancy, 16 chunks, smoothing lighting maximum, clouds fancy, particles all, mimap 4, biome blend 5x5
Test was done in a jungle biome, not in spawn chunks. sufficient time was given for chunk loading.)


Modded has become slightly better, since i got this rig end last year, but it still dies: starting with a good ~50fps chilling around there and then 5 to 30min in it dips to ~0 and never recovers.

I have allocated anywhere between 1G to 16G of ram where more ram just takes the stuttering to a new level. rip gc. I have tried overclocking by bumping up the multiplier but with little effect. There is a lot of things that i have tried over the course of 5-6 months but to no avail. This is now with both vanilla and modded

So in my desperation i tried the myth that amd64 drivers are optimum on Linux OS. So i got Ubuntu running (had Kubuntu but didn't like it) updated everything that could be updated. I installed Minecraft for Debian and copied the modded stuff, from my twitch files, over. changed the java args and then... well it worked. I was frame locked at 60fps and i used the default Video settings.
This worked for both sky factory 4 and Sevtech(I might have ran a higher render distance for this.)

So in my conclusion the amd drivers for the vega 11 is inefficient for LWJGL on windows with respect to OpenGL.

Now finally my question 😅 Is there some way to fix this so that i can get the same performance on windows as what im getting on Ubuntu?
 

Valicious_

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It sounds like a memory leak. Compare your RAM usage in the first few seconds of it running vs when it's unbearable
I first wanted to test this is vanilla: ran with 2G allocated. when i started it was on 2.4G and went up to 2.5G later so that isnt much of a change. using alt+ f3 i can clearly see the the lag spikes. the biggest I spotted (i just stood there) was this View: https://imgur.com/a/6sNDbWJ
.

running modded on '-Xmx6144m -Xms256m ...'
main menu is on 6.3G. In game i get 8G
The memory useage shown is (~2.7/6G f3 screnn) and now it went down to 7.2G.
Strangely enough it didnt get to an unrecoverable drop again but the stuttering is stall bad
 

Mandark

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Valicious_

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Nov 12, 2015
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try this
Hi, I have tried this and it doesnt work. That technique, in theory, should just give you a few extra fps (because you basically turning everything off) and both priority and affinity wont make a difference because im not maxing out my cpu (not that you can max out your cpu with minecraft since most of the game's core run on a single thread).
Also i did mention i can run it perfectly on a different operating system, using different drivers, So to make minecraft run easier and give it higher priority doesnt fix the problem.
 

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