• Minecraft Version: 1.10.2
• BetterFps Version: BetterFps-1.4.3-1.10.jar
• Forge/LiteLoader Version (if any): Forge 12.18.3.2254
• Other Mods: Sky Factory 3 modpack (with some mods removed, but I don't think this matters) + Bounding Box Outline

Turn off the fog. Restart Minecraft. The fog is still present.

Also, I was doing some more testing and noticed that with the fog option on the fog starts very close to the player. So, since you doubted it, this confirms that the option does work. Just not as intended.

That is really strange... Unfortunately, I can't fix a bug that I can't reproduce.
I'll leave this issue open for now in case someone else has the same problem.

I think it's a problem with the config file. Can you open the BetterFps options to see if the Fog option did change?

It did, in fact. Both in options menu and in the config itself Here's my config:

{"algorithm":"rivens-half","updateChecker":false,"preallocateMemory":false,"fog":false,"beaconBeam":false,"fastHopper":true,"fastBeacon":true,"fastSearch":true,"asyncSearch":true}

Removed all mods except BetterFps. No change.

I've just tried it in Sky Factory 3, and it seems to work perfectly well. I didn't tried with Bounding Box Outline though.

Can you send me the console logs?

Here is the log with only Forge and BetterFps present: https://pastebin.com/EtGWL0xm

Are you sure the Fog is set to "Fast"? Can you send screenshots proving that it's not working?

Everything is working fine for me

http://imgur.com/a/P3dM4

Are there any other? Here's options.txt: https://pastebin.com/Eshx0HM2
Also I had particles on "Decreased" at the time of testing, but later had to switch to "Minimal". Haven't tested the fog option since then.

Can you send all your options? (Preferably the options.txt file)

The new version with the fix is out. Sorry for taking too long D: