On the PB G4 12" 1.5Ghz , HTML5 VP8 360p Youtube playback smooth once buffered, even better with MSE WebM/VP9 enabled and this on "Better Battery Life" on WiFi.
Are you running tweaks, add ons etc?
I have tweaked config plus Bluhell and NoScript, however my results are abysmal. Both 17" 1.67 and 12" 1.5 Powerbooks are slide showing for nearly a minute before playback settles (with or without MSE) on 360P. 17" handles it's own CPU rating but the 12" is set to highest - in both cases, CPU between 95-100%.
This is exactly the same performance I had in FPR4 too...maybe the optimal code benefits multi-processors only?
Just tried on my G5 but just like TFF FP4 it doesn't allow for HTML5 playback in Youtube , no VP8 or Webm/VP9
Strange, works fine on my G5 iMac.
On your G5 TFF works without Viewtube or QTE ? What settings are enabled when you got to www.youtube.com/html5 ?
On G5 iMac
View attachment 744539
That's with MSE selected in TFF prefs - I usually turn them off as playback is better but Youtube plays either way and no, that's standard, not with Viewtube or QTE.
Ninjakit kit still working for me on Powerbook (not installed on G5s) - best Youtube browser out the box though is Roccat (not linked to LWK) but it is crashy.