I was researching how to run Battle net games on Zorin 18 and came across several options like Lutris, Heroic, and Faugus. I tried Lutris and Heroic, but they were much more complicated to open and configure. I tried Faugus and managed to run Diablo 4, but experienced a huge performance drop! On Windows 10, Diablo 4 runs at 75 FPS (monitor limit), but on Faugus, killing enemies in Diablo 4 caused the FPS to drop drastically, staying between 30-40 FPS. I gave up on Faugus. But now I've seen some videos of Linux users combining Battle net with Steam, and I was quite surprised by this possibility! Would I get better performance by configuring Steam to open Battle net? Is this feasible?
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(Note: For most of this post, I'm leaving the dot out of Battle.net. This is because the forum autocensor once BANNED a user in a thread about Battle net because the name is also a URL, and it decided the user was spamming. It even auto deleted replies. Mods were able to recover posts, but not the user account, so I'm taking no chances.)
I'm not familiar with Faugus, but I wrote up a walkthrough for getting Battle.net working via Bottles and Heroic some time ago. The walkthroughs are a bit older, but a user relatively recently said my Heroic instructions worked perfectly for them the first try. You can find that here:
[HOW TO] Use Battle.Net on Zorin (Diablo 3, Diablo 4)
To more directly speak to your issue, Steam may well give you better performance than Faugus, but it depends entirely on what was ruining Faugus' performance. If it's your video driver, Steam will likely turn out exactly the same. If it's related to Proton (the software that makes Windows games run under Linux in most cases), Steam might do much better.
Running Battle net under Steam is entirely possible. In a nutshell, Battle net's installer needs to be added to Steam as a non-Steam game. This is done by downloading the installer, choosing Games > Add a Non-Steam Game in Steam, and then following the prompts. Once you're done, you'll have the Battle net installer (not Battle net itself) in your Steam library list. Select it and click play as if it were a game, and you'll go through the Battle net install process. Now you'll have to repeat the Add a Non-Steam Game steps again, but adding Battle net itself. This will require finding it, and to be honest, I'm not sure where it will be, as I've done this with other launchers, but not recently. Once Battle net itself is in your library list, you can run that, and install whichever games you want to install. You can also remove the Battle net installer from your library, since you'll be using the Battle net entry. Sorry these instructions are not more precise--I wrote two detailed walkthroughs linked above for other methods, but I don't use Steam for Battle net personally.
One important caveat: Blizzard is known for breaking Battle net in Linux from time to time. It's not deliberate. They're making changes that break Linux because they don't CARE about Linux, and then the Proton developers have to clean up and make it work again. Accordingly, you may need to change the version of Proton you use with Battle net via Steam. There are instructions on how to do that in this forum as well.
If you require more detailed steps for getting Steam to work, I can try to provide them this weekend, but please give what's here a shot, just in case it's enough for you.
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I'll be honest, I've never heard of this Faugus. From the screenshots I see of it, I don't see how it's less complicated than say heroic. Lutris is definitely a bit on the rougher side when it comes to ease of use, most definitely. I haven't tried to run or use Battle net in a LONG time, but in this Faugus, in the Wine settings / Runner options were you selecting a specific version that may not have been very optimal? I generally like to stick to either Valve's proton versions OR Proton GE as they tend to be the most compatible (generally GE gives better performance for me, but sometimes it comes at the cost of compatibility).