Originally Posted by Thurallor
Check the memory usage of LOTRO when the crash occurs. Most CTDs are the result of running out of memory. (As a 32-bit application, LOTRO can only use ~ 3.5 GB before it runs out, regardless of how much memory is in your machine.) So none of the plugins may be the culprit; but using all of them at once may use a lot of memory, thus exacerbating LOTRO's normal memory issue that won't be resolved until the 64-bit client is released (hopefully in the next few months).
Once again, Thurallor to the rescue. <3 You're pretty awesome.
I do know that Minas Tirith, even without a lot of people in it or with any plugins loaded, can cause a little bit of lag...so you're most likely right.