Fairly certain Optifine changes some of the same code BTW does; so sadly the mods won't work at the basic technical level.
The good news is that Flowerchild worked hard on performance- so BTW runs very smoothly on its own. Also if you dig around the BTW forum, you'll find some texturepacks that'll support connected textures as well as technical advice on how to get everything working. http://www.sargunster.com/btwforum/viewforum.php?f=12
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A mighty machine built within the wake
Of a long dead dream, little demon awake
The citizens sleep, never quite knowing when
The device will reawaken, hungry again.
I think the reason everyone keeps asking for Optifine compatibility isn't optimization stuff, but shader usage, for which there is no workaround except to install Optifine...
I play BTW on a low laptop, because I'm poor. I used to play on tiny render distance for a year now and I have around 18-20 FPS in the most time. On normal I had played since Mart 2017 ( with the newer version the FPS was going down).
2 weaks ago I started again on the latest version and got the perfect world I could imagine (but FPS was 12-16 on tiny... )and of course I died yesterday due to a lag spike, I was killed by a skeleton...
I have played a lot of modpacks on versions 1.7.10, 1.10 and tried 1.12 always with optifine (on 8-10 render distance I have around 30FPS!!!) and I have never had such bad experience with the performance of the game.
I love the BTW. It's gameplay is like all I like combined in one game, It's mind blowing, crazy awesome.
I'm appreciated I could play it on even such low FPS and monstrous lag spikes.
For 3 years now I'm waiting for a kind of optifine boost to enjoy my favorite game and you came here and said It's not necessery...