Minecraft Low End Shaders. It was specially optimized for it. Here is the DocteurDread's Lagless Shaders and especially the low version.
And, funnily sufficient, whereas most different shader packs are inclined. It truly runs somewhat higher for me on my (high-end) rig than the opposite "go-to" shaders on this Even on Low, it seems like a brand new Minecraft. You don't need an extremely good PC for this shader!
We run the gamut between lightweight, performant shaders and beastly packs that require high-end rigs to run.
Older than that, it's still useable but it have some.
It was specially optimized for it. Make your Minecraft spooky with this fantastic Shader pack called Magnificent Atmospheric Shaders mod. Decided to do a Shaders mod thing, if someone could be interested in my favourite, low end shader mods.