Q: Is OSX/Safari update (21st March16) a help or a hazard?

For the last month or so I've been grappling with a Safari issue where it freezes at just one or two particular websites, and fortunately for the time being have found a workaround for that. On my machine, Safari nonetheless remains slow and unstable, to say the least. Even a few nights ago it refused to open a number of sites I regularly use, without a lot of re-tries. I've of course attempted all the usual remedies, such as clearing of caches, plists, etc, but to no avail. With Safari, the rot really set in with the February update, in my view.

If the numbers and kinds of Safari issues reported in this and other Apple Community forums for the past four or five weeks alone is anything to go by, I'm not the only person who's all but lost faith in Apple to sort this out. (I've sent several reports to Apple about it, via http://www.apple.com/feedback). Okay, over one or two points it might not be the fault of Safari entirely, as evidence seems to show that a number of websites around the globe have made changes in the last couple of months that now make their website presentations less compatible with mainstream browsers. That kind of thing has happened in the more-distant past as well.

But what of the very latest OSX/Safari update package, the one issued on 21st March just gone? I've deliberately held back from installing it. Is it advisable to install it, given the dreadful reports from users that I'm seeing? I do my updates manually, incidentally. Would it be better to wait another month, in the hope that Apple will have woken up and done something about Safari by then? Is there, in fact, anyone in these forums, using Mavericks, Yosemite or El Capitan, and who's a daily user of Safari (and not just the odd one or two favourite websites) who can put their hand on their heart and say they've a 100% stable Safari, having performed or accepted the 21st March update?

[I guess many of you reading this have an arrangement where you allow automatic updates, rather than you doing them manually, and so you may not be aware of precisely which versions of OSX/Safari software you have on your machine at present. Clicking on Apple icon > About This Mac will give you the OSX version, and similarly, Safari > About Safari will also give you the Safari version].

Safari 9.0.3

Mavericks 10.9.5

Late 2013 iMac