To fix this join a better server that is also closer to you. Your problem is not mods but connection to the server. Either because you are to far away or the server has bad connection.
Well this could be lack of memory and a problem with your Minecraft server. I think you should create a bukkit server. These servers are much more reliable.
So you are looking for a team of players to play on a survival server? If you just want to play on a survival server just go to the server section of this site and look for survival servers. Cheers -Alex
Go to your start menu Type in %Appdata% Then go and click on Roaming After that click on .minecraft Click on saves And drag and drop your world into the saves folder.