i have a big modpack and optifine installed, so when im trying to change shaderpack it takes a lot of time. to deal with that problem i did a shader-changing mod on client starts, but it's doesn't work when im changing shaderpack in it (shaders applies only after restart). So the question: can I start my mod before optifine starts? 
If any description will help: my mod is using javax option panes only, so the mod is only showing a pane with shaderpacks choose and then writes it to optionsshaders.txt

Edited May 9, 20214 yr by vladuska

10 hours ago, vladuska said:

So the question: can I start my mod before optifine starts? 

Nope, optifine basically doesn't care about Forge and does it's own thing. It's black-magic voodoo personified.

Solved the problem with tweaking my mod class, before client even starts.