1184893 - layers.acceleration.draw-fps showing incorrect FPS values in firefox [Version - 39.0]

Status: RESOLVED DUPLICATE of bug 1150552

(Core :: Graphics, defect)

Description

[Brahma]

Attachment: This screenshot showing three values in top left corner.

Hi Team,

We are trying to measure FPS [Frames per second] in firefox browser using layers.acceleration.draw-fps=true through about:configs settings but it seems this is showing incorrect values for fps.

At top left corner it shows three values [look at attached screenshot]. First value is FPS but its showing some random values and on doing mouse hover on that number it decreases/increases very frequently.

Please let me know how can we get exact values of FPS through this tool.

Comment 1

[J. Ryan Stinnett [:jryans] (Use needinfo, replies may be slow)]

Jeff, you provided some feedback in the similar bug 1052346.  Does this seem like a separate issue?

Comment 2

[Brahma]

Any update on this ?

Comment 3

[David Anderson [:dvander] - inactive, e-mail if emergency]

For what it's worth, I tried using the FPS counter a few months ago and ended up concluding it was bogus. That or its definition of "FPS" doesn't mean something useful.

Comment 4

[Jeff Muizelaar [:jrmuizel]]

I think FPS might be broken on Windows because of partial present. i.e. We don't include the FPS counter in the region that needs presenting.

Comment 5

[Brahma]

So do you means to say we can't calculate correct FPS in firefox browser. Is there any alternative for this ?