I confirm what was written by the user WIndolin on the Mac Technical Support section of the LOTRO official forum : on my 8Gb Mac Mini M1 with macOS Monterey 12.6, LOTRO runs surprisingly well. I'm using the Crossover 22 trial.
I must point out that I am not really "playing" the game .... I just wanted to give Crossover Mac 22 a try and I thought of using LOTRO as a test (I participated in the beta eons ago). So, to be honest, I just walked around Thorin's Gate with a dwarf Liv. 1 and Refuge of Edhelion with a high elf Lv. 1.
Curiously, when set to ULTRA the framerate was more stable than on HIGH and VERY HIGH. The most convincing explanation is the one posted by the user Tralfazz on the same thread:
Most likely, the difference between VERY HIGH and ULTRA which is making the positive difference for you is the OPTIONS->ADV GRAPHICS->TEXTURE FILTERING scheme. Most likely in ULTRA this is set to ANISOTROPIC while in VERY HIGH or HIGH it is set to something else such as TRILINEAR or SHARP. Even though the ANISOTROPIC filtering scheme is more advanced and produces better results, on some hardware it is also much more efficient than the others as long as the anisotropic filtering level isn't set too high. (4 usually produces very nice results without stressing low-end or modest hardware.)
So, at the moment I'm running the game with these settings:
Resolution: 1080P (full screen - windowed)
Preset: ULTRA
Some settings are one or two notch lower (but I'm still experimenting):
Object Draw Distance
Surface Reflections
Landscape Draw Distance
Texture Filtering
Antialiasing
Finally, I set the maximum framerate to 60 FPS in the Troubleshooting section.
I find it surprising that it works so well on an entry-level M1 (evidently, in this case at least, the DirectX 11> Vulkan> Metal translation in WINE is working great).