Is it just me and my server or is the new stable release of roundcube really slow compared to the old one?

What version are you using?

I believe we have the latest version installed on our servers, and it works well. Do you get any timeout messages, or software simply keeps loading slooooowly?

When I try to send a message on mine it sits there and says sending and does nothing.

Maybe simple re-install or forced upgrade will help? It takes only a few minutes and costs nothing to try, right?

There is no issues with roundcube on our servers. It sounds like a slow network (server or your client's end) or a flaky installation. I would guess a slow network rather than anything else from either end.

It's slow for me personally even. I am on a 20 megabit connection with plenty of computer behind that. The original roundcube and everything else off that server delivers fine, but this version seems slow. I did a fresh install of it in its own directory. I think it was 3 stable that I installed?

Its may be sometime happens due to high load on the server. Make sure your server is not loaded as its might also effect getting Roundcube performance slower.