Friendly PSA for Stuttering
I used to deal with a lot of stuttering when I transitioned over to PC but wanted to share as LOTRO seems like a very CPU-bound game on old computer logic so even newer rigs can struggle sometimes. I'd like to share the few things I have done (not a PC guru at all, just by some searching) that at least helped for me and would like to echo a post that didn't get much traction;
https://www.reddit.com/r/lotro/comments/1ngryzm/how_to_increase_3050_fps_using_dxvk_on_windows/
Following that guide with a very simple install and even a manager for other applications significantly boosted my FPS/at least heavily reduced stutters from the getgo, and the installation is extremely easy, just placing a file in the LOTRO folder and is very safe.
Other things I recommend if not tried already;
In-Game:
Turn off Chat Profanity Filter, Disable 3d Object Portraits (For some reason these 2 seem to have a big effect on a lot of players) set Player Crowd Quality and Frill Density lower (not much visual impact at all). Lock your FPS to your refresh rate, and set your refresh rate to the max your monitor allows.
Task Manager:
Set LOTRO to have High or Realtime Priority (You can change this to always be the case when you launch with a quick google on how to have a program always run at a specific CPU priority)
For NVIDIA users;
If you have an NVIDIA graphics card, turn on Image Scaling in the App or Control Panel (I set my sharpness to ~30% and see no visual difference, likely only works in Fullscreen AFAIK.), turn off V-Sync, and set your default graphics card to your actual graphics card (unsure if this makes a difference for the large population) rather than the default.
I still experience some stuttering when lots of players are online or concentrated in a busy area, like in festivals, but it is much more manageable than before and usually isolated to those specific areas due to FPS drops. Otherwise, it has worked wonders for me and hopefully it does for you.