Were you using this Mac to play LOTRO using SSG's "Mac" client? (I put "Mac" in quotation marks here because it isn't really a Mac-native client, it's just the Windows version of the game packaged with a very old version of WINE. It's not significantly different than the version of LOTRO you're running in Crossover except Crossover is the very best version of WINE you can run instead of the open-source version from several years ago – but the LOTRO program itself and all its components are exactly the same.)
If so, do you still have SSG's "Mac" client installed on this Mac?
If so, try running that version of the game. Before you do so, you must set your UserPreferences.ini file so that the 32-bit client will be launched because SSG's "Mac" client cannot run the 64-bit client. To do so, change this one line in your UserPreferences.ini file:
GameClientType=1
If you do still have SSG's "Mac" client on that machine I'll be very curious to learn if you experience the same overheating issues. You should experience pretty much the same performance as using the 32-bit client in Crossover, the only difference should be some warnings from the LOTRO Launcher application about missing stuff that you can't easily do anything about because the WINE bottle packaged with that version of the game just doesn't have that stuff; but the game should run.
If you can try this, when done remember to set GameClientType=3 in your UserPreferences.ini file to go back to the 64-bit client for use with Crossover.
Obviously I don't know what your financial resources might be and what you are comfortable investing in hardware just for the sake of playing a game. However, I will point out that you can get an M1 Mac Mini from the Apple Refurbished store (i.e. cheaper than new but literally as good as new) for as little as $589:
https://www.apple.com/shop/refurbished/mac
https://www.apple.com/shop/product/F...f6f80db7706dbc
Yes, it has only 8gb of RAM but there are plenty of people running LOTRO on M1 Macs with only 8gb of RAM and none are experiencing issues, Apple SOC Macs use their integrated RAM differently than Intel Macs. Yes, it has only 256gb of internal SSD storage but all you need is room for the OS, Crossover, and LOTRO (and whatever couple of other things you want to use on it) so as long as you don't need to keep your movie library or lifetime of photos on that machine's internal drive, it will be fine for your purposes. And of course, you could run both machines side-by-side and just plug in your keyboard and monitor and whatnot to the machine you want to use at that moment, allowing you to keep using the 2014 Mini for whatever non-LOTRO tasks it is performing for you. And naturally you can store as much non-OS data as you want using external drives.
(Note that newer is better and more is better and better is better, if you can afford a model with 16gb RAM and a larger SSD, go for it.)
I think you can play LOTRO on your current Mac. I don't think it will ever be an optimal, or thermally cool, experience. You might not have known it at the time you made your purchase, perhaps this is the first time you are hearing it, but the 2014 Mac Mini was a stinker. Sure, it was – and still is – fine for "general computing tasks" such as web browsing, office applications, very light photo editing, managing a music library, watching YouTube or iTunes movies, and all sorts of other things. But in nearly every respect it was a step down from the 2012 Mac Mini, which could be configured with a quad-core CPU and has user-servicable RAM instead of soldered RAM and other things which continue to make it a better choice than a 2014 Mac Mini even today in 2022. Sorry, I don't like ragging on somebody's hardware because sometimes it's all they can afford and
there's nothing wrong with that and sometimes they have an emotional attachment to the machine or their decision to purchase that specific machine. But you have one of the few Mac models made in the last 11 years which are just terrible for playing something like LOTRO due to their design limitations, and the amount of RAM and the spinning-platter hard drive installed in yours allow that machine to function at its worst. So until and unless you move to some other hardware (and I
totally understand if you either can't or just don't want to), use TurboBoostSwitcher to keep your Turbo Boost disabled and try to not worry about the temps if you aren't relying on your 2014 Mini for any critical tasks – just enjoy the game.