I have just installed the shaders mod to make a Minecraft Machinama, but the lag from all of the shader packs are terrible! My FPS drops from 300 to 30 with almost every single one! So I am wondering if there is any possible way to reduce the lag without having to lower my settings. Thanks!
Asking to impove fps without reducing settings is a bit strange, optimisations usually require compromise. If your PC/Laptop doesn't have the hardware for the task there isn't much you can do about it.
If for some reason you haven't already installed optifine, this would be a good first step, after that reduce settings to a level where everything looks as good as it can without ruining framerate.
bear in mind that if you are attempting to record play with something like cam-studio or fraps, your frame rate will reduce significantly again while the recorder is in use
Good luck :)
Another thing you can do, if you have a Windows computer, is to go to Task Manager and set the priority of "javaw.exe" to High or Realtime.