It is, sadly, true; the web interface is wretched.
Elsewhere on the forum I read "It works better if you throw away most of the transponders". What a solution! The interface can't handle the data, let's discard the data...
I can say that I have tried different architectures, (Intel, AMD, ARM), different OS's (Windows, Linux, Android), different browsers (Opera, Firefox, IE, Chrome, Android Browser) and it blows royally in all of them. My little AMD E-450 utility PC's CPU is driven to 100% for minutes at a time. My Core2 quad system doesn't have that problem but is still dog slow and - above all - prone to freezing for 30-second periods. Channel editing is awful, because then you get the 30-second freeze, plus the scrolled list scrolls back up to the top, so you have to scroll back down to where you were. If you click on something and it doesn't respond, then there's the horrible knowledge that in 30 seconds you're going to see the click land somewhere at the beginning of the page, not where you wanted it.
Plus the layout! Windows within windows within windows, a proliferation of scroll-bars and tabs, non-adjustable column widths. Well, the column widths might be adjustable (mousing over them brings up a left-right arrow) but any attempt to do so - yup, you guessed. It freezes.
Whilst all this is happening, the server rubs long happily on 2-5% of an ancient Phenom server, even running 2 tuners at once.
What's most disturbing is that this interface problem doesn't seem to bother anybody. This is the first post I've read here that tells it like it is. I seriously thought I was on my own, but knowing that I'm not doesn't make me feel any better.
Thanks for the tip about the alternative, I'll go and check it out. Plus if there's any chance of a CLI, that might help.
PS: If this sounds grouchy, intemperate or simply trollish, my apologies. But I've been wrestling with this for months, and I'm running out of good will.