I’ve been trying out a few heavy duty experiments with Babylon. On a low end device, this causes the fps to drop to ~14 sometimes. I do see that the absolute fps is like 70-80. Wanted to understand the difference between the two and what might cause the FPS to drop below the absolute FPS.

You could also do smthg similar to our AbsoluteFpsStrategy public static AbsoluteFpsStrategy(): PerfStrategyInitialization { return (scene) => { let startTime = PrecisionDate.Now; let timeTaken = 1; const onBeforeAnimationsObserver = scene.onBeforeAnimati…

getFps is a rolling average over 30 frames, whereas the other one is an average over the last second meaning over the last seconds we have an avg of 70 80 fps whereas the rolling average over the last 30 frames is about 14

Hi @sebavan , is there an easy way to get the absoluteFps in BabylonJS? I only find this but not sure this is the best reliable way? getAbsoluteFps(): number { let defaultFrameTime = this.engine.getTimeStep(); return (1000.0 / defaultFrameTime); } Thanks a lot for you help, …

@PichouPichou we now have a super easy way to track absolute FPS with our Performance Profiler :slight_smile: Introducing the Performance Profiler!

[image] Harkirat_Singh: Wanted to understand the difference between the two and what might cause the FPS to drop below the absolute FPS. I’d like to bounce on this old topic, because I have the same question and didn’t really find my answer here. I’m not having issues measuring the one or the…

Browsers are limiting your FPS to prevent any waste of frames as your screen would not be able to render them anyway. So in the most common case, your browser will target 60FPS (not speaking VR or fancy monitors here). In this case the RequestAnimationFrame callback used to render frames will be ca…

Thank you. I do totally understand this part, but this is not my case. The code runs below 60fps (especially on older systems/GPU). I get things like an absolute FPS of 54 and an FPS of 25. With fairly stable numbers.

Absolute FPS does not account for GPU spent time which in your case might be half a frame reducing then your total FPS abilities.

Oh, amazing. Thx so much for the info. I was indeed testing on a very old system (a decade old 1GB average at that time GPU) as compared to a fairly new (medium range) 4GB GPU from late 2019. I do now much better understand why I get this discrepancy. I would have another question though: How shoul…

GPU + anything not related to babylon as well like GC, css anims… and such + idle time to wait on vsync :slight_smile:

FPS being less than absolute FPS

Questions

carolhmj February 1, 2022, 11:41am 5

@PichouPichou we now have a super easy way to track absolute FPS with our Performance Profiler Introducing the Performance Profiler!

Topic		Replies	Views
How to calculate absolute fps :> Questions	5	110	November 26, 2024
Display absolute FPS Questions	2	293	March 14, 2024
Artificially limiting framerate Questions engine	24	1299	April 12, 2025
FPS Capping at 30 or 60 fps Questions	9	813	April 15, 2026
Récupérer la valeur du FPS théorique et pratique Questions	1	412	July 30, 2021

FPS being less than absolute FPS

Related topics