1452873 - performance issue with javascript game emulation

Status: NEW

(Core :: Graphics, defect, P3)

Description

[Jan Willem]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:61.0) Gecko/20100101 Firefox/61.0
Build ID: 20180408220126

Steps to reproduce:

Play this game: http://www.ssega.com/play/golden-axe/730#
Use the 'javascript emulator' to reproduce.


Actual results:

Sound is very choppy, hardly playable.
Collected some performance data:
https://perfht.ml/2EzE0nN


Expected results:

Should play ok, works on Chrome.

Comment 1

[Alice0775 White]

I can reproduce the choppiness sound on Nightly61.0a1 x64 Windowx10. But not on Chrome Dev67.

Comment 2

[Alice0775 White]

STR
1. Open http://www.ssega.com/play/golden-axe/730
2. Click on [Javascript Emulator] button and wait to finish ad-movie
3. Click on [Start Game] button
4. Click on table() under a picture
  --- observe, sound is choppy
5. Wait to finish logo animation and game title animation
  --- observe, sound is very choppy
6. Press [Enter] three times to select the number of players etc... so that the game will start
  --- observe, sound is very choppy, The animation of the game is also slow and choppy

Comment 3

[Nico Grunbaum [:ng, @chew:mozilla.org]]

I checked as far back as Firefox 51 and there are the same symptoms. The emulation speed (even in the silent part) is noticeably slower than Chrome. I am not sure this is a web audio problem as much as a performance issue. An emulator that is failing to deliver samples in a timely manner would exhibit choppy audio. Alex, would you mind double checking me before we move this to another component?

Comment 4

[Alex Chronopoulos [:achronop]]

Paul, would you like to check this with your quality measurements patches? It has been reported in Windows and OSX and I am reproducing in Linux. It's a fun test.

Comment 5

[Paul Adenot (:padenot)]

Looks like we're too slow to feed audio on time. Let's send that over to graphics.