Server Issues - Host or Pack?

[Wannabeuk]

Hey guys,

I'm posting this here rather than bugs because I don't think this is a bug specifically.

I'm having some issues with my server, with some serious lag spikes and consistent block breaking lag. Also noticed that the AI is jerky and stops moving when chasing at times. All this points to the server being unable to run, however it has 3GB of memory and the stats show only 2% CPU usage and 25% memory usage.

All this happens with 1-2 players online, now i've spoken to my server host who claims that this is being caused by a plugin within the pack due to the following error:

[ForgeModLoader] Detected leaking worlds in memory. There are 2 worlds that appear to be persisting. A mod is likely caching the world incorrectly

Now my research suggests this isn't really a big issue and that it happens to most people, however the host seems unwilling to look any further into our issues. My question is this:

Is this error something to worry about? Can we do anything about it, and is anyone else having these issues? we're running the latest version of tekkit lite 0.5.9, with forestry and railcraft added.

Cheers for your suggestions guys.