I don't really know why you guys are getting this. Doing this allows my G5 to handle a lot more Webkit windows and tabs as well. Using regular WebKit with more than 3 tabs gets waay to slow for me.
The reason I'm sceptical is because when doing the research for this:
https://forums.macrumors.com/threads/realplayer-vs-quicktime.1980864/
I tried out at least 20 user agents and did lots of testing - for me iOS7 was/is unsuitable. I'm always trying for new ways to get more out of these old machines so keenly look to others when something new is found and if iOS7 works for you and others that's great.
But for me, across three machines, it simply produces bad results - by that I mean, Youtube stutters where before it didn't and Twitter consumes nearly twice as much CPU.
Maybe it's because I'm comparing to my base system that's already optimised and yours wasn't?
You say iOS7 is the only way to go for Souncloud but I've been running it on standard Webkit for as long as I remember.
And personally, I've never had problems having loads of tabs open in Webkit or playing Youtube on top G4s and G5s.
If anyone is having great success using iOS7, especially on a G4, please give feedback as this will mean there must be something wrong with all my Leopard machines

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I've installed Webkit 600 from here
https://sourceforge.net/projects/leopard-webkit/
ran all the scripts , meaning install newer SSL certs, link everything to Webkit.
I could be about to eat my words...I thought I had the latest Webkit as a new version come out in June - this one's even newer - getting it now.
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I've installed Webkit 600 from here
https://sourceforge.net/projects/leopard-webkit/
ran all the scripts , meaning install newer SSL certs, link everything to Webkit.
This is confusing, your link is the latest version but its 600.8.10_2 the one I have, which was released in June is 601.7.5?
Is everyone using this installing the full webkit framework? Maybe that's the key - however I'm reluctant to do that as in the past it breaks apps.