How do I get more FPS with BSL shaders?
Means How can I increase FPS in Minecraft With BSL Shaders and Optifine.
You can attempt to also just- not use optifine and try sodium / iris
Sodium and Iris are a fabric mod which are still being worked on, but once they're fully finished they should be much faster than Optifine, which hasn't had a decent update in awhile
Right now Sodium already offers better performance than optifine on lower end hardware, and Iris aswell, so they may be a better fit (They fully support BSL at this stage)
Iris Shaders - Modrinth