BuildCraft version: 7.99.13
Forge version: 14.23.1.2555
Optifine version: 1.12.2_hd_u_c7
Singleplayer or multiplayer: single

Hello, due to BC FPS fell by half! What could be the problem? Thx.

With BC:
https://i.imgur.com/qezoYcR.png
Without BC:
https://i.imgur.com/SAbt8wK.png

Can you find the expensive element with buildcraft by using the debug pie (Shift+F3)? If its root.tick.textures.AtlasSpriteFluid then you're experiencing #3616.

https://minecraft.gamepedia.com/Debug_screen#Profiler_graph - when the graph is open, press 1-9 to go into one of the areas, or 0 to exit. Can you navigate to "root.tick.textures.AtlasSpriteFluid" and take another screenshot?

(And no, it's nothing todo with tps)

I do not find "root.tick.textures.AtlasSpriteFluid"

https://i.imgur.com/z6SMkQj.png

Can you turn off HD textures or increase your gui scale temporarily? It's very difficult to read the text at the moment. (Although I think if you press 2 directly from that screen then it will take you into "root.tick")

Here:
https://i.imgur.com/ncdIF8R.png

And how to increase your scale?

Can you re-upload that image as a direct ping file rather than a jpeg file? The compression is making it impossible to read the text...

You can increase scale from the options menu > graphics settings

https://i.imgur.com/QdyWoFf.png

Thanks! That confirms it, its definitionally fluid sprites being the issue rather than a new thing. Can you try using tise static fluid resource pack, as that should stop BC fluids from animating.

Many thanks!! Close.

(Note that its still technically an issue, but this duplicates #3616 so I'll track its status there. At some point the static resource pack should become obsolete)

I do not know what is this..

https://i.imgur.com/pB14LmE.png
TPS:
https://i.imgur.com/VPPa5Zl.png