I don't know what the boffins have done, or if this post is in the right forum, but PCA is back to its old speed. It's bliss to be able to change forums, refresh, and almost instantaneously it works without the long script.
This really highlights our problem, because as far as I am aware we have have done nothing in terms of altering anything in the past 24 hours that would account for your experience.
The truth is that performance can vary considerably from day to day, and at different times of the day and night. This is invariably connected with site traffic, and the fact that at twenty past midnight, when you posted your comments, American office workers are shutting up shop for the day and heading home; their business emails have all been sent, the Eastern seaboard markets have closed, and the American e-commerce machine is slowing. VISA servers can begin to cool as the millions of day-time transactions start to decline. Internet traffic volumes drop in the couple of hours between Americans leaving their work and hitting the web for a bit of night-time bandwidth consumption.
Track the sun as the earth rotates, and you'll have an idea of how internet bandwidth requirements are directly related to daylight business hours and evening relaxation sessions.
I'm not saying that this was definitely the reason for your good experience, but I'm willing to bet it was a big part of it.
The thing was it happened suddenly, that's why I noticed. It's still good. No doubt that global traffic can affect things as you say but to that extent? I'm just wondering if it's at my end that something has changed or to do with my ISP? I haven't altered any settings and the latest updates I've just installed now. I'm certainly not complaining :)
It may simply be one of those 'who knows?' situations. I've worked with web servers and networks for a long time, and I've learnt to accept that where performance is concerned there are sometimes no discernible causes for slow or fast page loading.
My biggest bug bear with the forum is the fact that it is based on flash based software which makes it pretty difficult to access. I use a mac and as Apple and Adobe have some issues I often have to restart safari to access anything with flash like youtube and Facebook. This is the only forum I have to restart safari to get it running at times. Even then it will refresh itself before I can access any of the threads or change pages.