I'm so glad to finally hear someone who agrees. I need a sort of cheap kiosk solution and everyone keeps going "hey, just use a pi, it's perfect!" but it is just too ridiculously slow. I'm not sure why everyone keeps suggesting it as the one size fits all solution for everything. In the end we just got a bunch of NUCs running some sort of kiosky Ubuntu version.
I could have lived with the 512MB RAM. But the CPU is really weak, and that's the thing I've noticed that web apps crave. People see 700MHz as not that bad thinking back to the PentinumIII but they are thinking in terms of Intel's crazy superscalar processor designs with all kinds of fancy branch prediction and cache prediction logic they use and used to really get the most out of that 700MHz on general purpose workloads. ARM has only barely started to compete with Intel on things like that, so I'm not even so sure about the improved Pi competitors. The GPU isn't that bad though, but you really have to be running Wayland to get the most out of it.