Converted simple snow scene from 4.8 to 4.9. Noticed framerate is lower by average 5-10FPS. Comparing the fullscreen views of the same cameras, the difference is ~10FPS, memory usage is higher a bit and number of objects is higher by almost 2000. What are these additional objects and why framerate is lower? How can I check ‘bonus’ bojects? 2500px screenshots in attachment.
Hey tonpix,
In order to troubleshoot your framerates and see where your project is bound you can use the Performance and Profiling documentation. It will help you identify where you project is taking the biggest performance hit as well as how to optimize your project’s performance.
You can also use the ‘Size Mapper’ tool within the Content Browser and compare the results between your two project versions. Let me know what you discover to be the culprit, and if you manage to get improve your projects performance.
Thank you,
I have the same problem in a scene of mine that I converted to 4.9. I did some profiling and it looked like the temporalAA and the SSAO pass took more time in 4.9. I saw in the changelogs that those algorithms did undergo some changes and SSAO also has new console options to tweak it’s performance. Could it be that those options did not convert well when converting the project?
To make the case more reproducible to you I have make a new project just using the blank map in both 4.8.3 and 4.9 (so no conversion). Set the level to the default one and disabled smooth fps.
I profiled at two different resolution to see how the algorithms scale. See atached .txt files with snippets from the logs with the timings. This was done on a system with a Geforce GTX 560. Notice the timings on SSAO, those are a lot higher now.link text
Hello, I have the same issue, no clue whats going on. On preview 4.9 preview 4 and on 4.8 I would have gotten 120fps on a blank scene. Now I can only get 90fps MAX. Unless I go into Unlit mode.
Hello TheAgent,
Would you mind going into your ‘Project Settings’ under the ‘General Settings’ and disable ‘Smooth Frame Rate’ option.
Let me know if you see a change.
Thank you,
I did another test at my computer at home. This one has a Geforce GTX 970. You will find the profiling results attached. This is done with the blank map and at fullscreen resolution (2560x1600)…
As you can see SSAO is taking a lot longer on 4.9. I do not have any benchmarks yet but I also noticed the same behavior on a computer on my work that is running linux and has a geforce quadro card. I will post any benchmarks later when I have time. But anyway there is some huge performance regression with SSAO on 3 different systems of mine.
It seems there is already a fix for the SSAO problem in master: https://github.com/EpicGames/UnrealEngine/commit/e7111598e7b77e1c766839db0d4e689626650a23
and in the 4.9 branch: https://github.com/EpicGames/UnrealEngine/commit/95f962d063e919b4d9b02967a75dbba7e3ba1a6b
So it will get fixed in the next hotfix.