I recently upgraded from 5.0 to 5.1.2, then a few weeks later to 5.5.
I really like 5.5, with one exception: interaction with the web control panel seems painfully slow compared to previous versions on the same box.
I'm running on a local 100baseT network, and I'm currently the only machine in use on it, so it's not a congestion problem.
To give you an idea -- if I log into the web control panel, the right-side screen comes up right away, but the left-side screen takes more than 20 seconds...and often does not come up at all. Another example -- I tried to remove a port forwarding setting, then add another one. Both steps resulted in browser access and all other network services being lost...for more than two minutes! The machine is a Pentium II 300, and has not been changed since installation of 5.0.
Has anyone else experienced this?