Measuring FPS in test Animation/balls.html with WebKitGTK+/r204029

This FPS analisis measures:

• 3 different variations of the test Animation/balls.html that use JS functions setInterval(), setTimeout(), or requestAnimationFrame() to schedule new frames.
• Different compositors and AC modes of WebKitGTK+.
• The videos recorded were all recorded at 60FPS and later analized with a small python program that tries to calculate the real FPS by checking how many frames are different on the video

FPS measured for each of the videos/tests:

• With the simple compositor (no threaded compositor)

• Standard mode, without forcing compositing mode
• Test balls-new-animationrequest
• FPS measures by the test JavaScript: 5.8 FPS [video]
• FPS measured by video analisis: 4.3 FPS [analisis]
• Test balls-new-settimeout
• FPS measures by the test JavaScript: 11.2 FPS [video]
• FPS measured by video analisis: 4.3 FPS [analisis]
• Test balls-old-settinterval
• FPS measures by the test JavaScript: 14.1 FPS [video]
• FPS measured by video analisis: 4.4 FPS [analisis]


• Forcing compositing mode (export WEBKIT_FORCE_COMPOSITING_MODE=1)
• Test balls-new-animationrequest
• FPS measures by the test JavaScript: 24.3 FPS [video]
• FPS measured by video analisis: 12.7 FPS [analisis]
• Test balls-new-settimeout
• FPS measures by the test JavaScript: 32.15 FPS [video]
• FPS measured by video analisis: 10.9 FPS [analisis]
• Test balls-old-settinterval
• FPS measures by the test JavaScript: 38.5 FPS [video]
• FPS measured by video analisis: 9.9 FPS [analisis]

• With the threaded compositor

• Standard mode, without disabling compositing mode
• Test balls-new-animationrequest
• FPS measures by the test JavaScript: 19.4 FPS [video]
• FPS measured by video analisis: 15.3 FPS [analisis]
• Test balls-new-settimeout
• FPS measures by the test JavaScript: 19.1 FPS [video]
• FPS measured by video analisis: 15.5 FPS [analisis]
• Test balls-old-settinterval
• FPS measures by the test JavaScript: 19.8 FPS [video]
• FPS measured by video analisis: 14.9 FPS [analisis]


• Disabling compositing mode (export WEBKIT_DISABLE_COMPOSITING_MODE=1)
• Test balls-new-animationrequest
• FPS measures by the test JavaScript: 6.7 FPS [video]
• FPS measured by video analisis: 4.2 FPS [analisis]
• Test balls-new-settimeout
• FPS measures by the test JavaScript: 12 FPS [video]
• FPS measured by video analisis: 4.4 FPS [analisis]
• Test balls-old-settinterval
• FPS measures by the test JavaScript: 16.3 FPS [video]
• FPS measured by video analisis: 4.5 FPS [analisis]