i think the server needs a restart badly
everyone's having issues, and i've personally been having BIG issues since you installed that plugin
chunks load as quickly as a slug when he's been running around an olympic track all day, constant disconnects, things of that nature
i've tried:
restarting my computer
reinstalling tekkit (twice)
reinstalling java entirely
restarting tekkit
rejoining
running tekkit as administrator (this is the only one that helped significantly)
allowing more memory to the launcher
and i'm still running into issues, as is Kyro