Phosphor reduces FPS by 3x

Question

Phosphor reduces FPS by 3x

Pyxrs opened this issue 4 years ago · 12 comments

Exactly what the title is. Fresh installation I get around 90 fps in normal survival, but with phosphor, I get around 30.

Specs:
CPU: AMD Ryzen 3 2200G
GPU: AMD Radeon RX 270

Seems like there is a severe bottleneck with AMD GPUs.

Dbl7id · Answer 1 · 2021-01-29T03:15:52.000Z

What version are you using? There is a build in Jelly's Discord that specifically addresses AMD cards. Not public, and still being tested. I'd join and ask for it, and see if you notice an improvement.

I think you may be referring to sodium?

Pyxrs · Answer 2 · 2021-01-29T02:20:32.000Z

It's been like this for earlier versions as well.

TheRobified · Answer 3 · 2021-01-29T02:55:51.000Z

What version are you using? There is a build in Jelly's Discord that specifically addresses AMD cards. Not public, and still being tested. I'd join and ask for it, and see if you notice an improvement.

Pyxrs · Answer 4 · 2021-01-31T21:43:48.000Z

I've been using Phosphor with this bug since 1.15 (I think) and I just identified what was causing the low fps now.

jellysquid3 · Answer 5 · 2021-02-03T02:32:39.000Z

Phosphor shouldn't be capable of bringing down average frame rates so much, and we've never had another report like this. Are you certain your game is using the right GPU device between Vanilla and Fabric?

Pyxrs · Answer 6 · 2021-02-03T03:10:19.000Z

I've done four (non-professional) benchmarks:
Vanilla: ~60 fps
Fabric no mods: ~70 fps
Fabric w/ Sodium: ~130 fps
Fabric w/Sodium+Phosphor: ~50 fps

Pyxrs · Answer 7 · 2021-02-03T03:10:46.000Z

In response to your question, no, I am not sure. How would I check?

altrisi · Answer 8 · 2021-02-03T03:24:25.000Z

The easiest way to check that is finding the GPU in the top right corner of the F3 overlay, and make sure:

It's the same in both tests
It's the dedicated one in case you have multiple installed

It would also probably be good to know what is it in case the issue is hardware specific.

Pyxrs · Answer 9 · 2021-02-03T03:35:24.000Z

Thanks for the tip, I will do that in the morning :)

Pyxrs · Answer 10 · 2021-02-03T14:40:23.000Z

It looks like on all tests, it is using my GPU. I also noticed that once chunks were loaded, phosphor stopped performing so badly. However, as soon as I turned around, it goes down to 40 fps average again. This effect is multiplied on normal survival worlds, with lots of caves and trees and such.

mrmangohands · Answer 11 · 2021-02-12T06:06:57.000Z

This is an odd issue, it would probably be easier to troubleshoot this over discord https://jellysquid.me/discord/

Otherwise if you could provide screenshots of each setup with f3 open at the exact same spot, daylight cycle off that would be the next step I suppose, after updating to 0.7.1

Pyxrs · Answer 12 · 2021-02-12T16:09:21.000Z

It's not too big of a deal, I can live without Phosphor for now :) thanks for your willingness to help though!

Share to