Rift shaders - super fast!
Rift shaders is ultra lightweight shaderpack for potato PCs, runs on entry-level cards completely fine. If you have MX350 (laptop entry-level), you should be able to run "potato" preset at 30-40fps
Rift adds lightweight effects such as custom water and lighting, godrays, Nether and End effects, etc.
Day and night are obviously reworked:

Nether is also reworked:

And lastly, the end:

All Versions
+ Add Version### Rift for 1.21.1-1.21.8
- Regional river, jungle, swamp, and ocean water with smooth biome transitions.
- Full tempest lighting: advancing storm clouds, stronger weather fog, wet
- Shadow-map volumetric godrays on High (8K) and Ultra (16K).
- Enhanced Minecraft water reflections at High/Ultra Water Quality.
- Colored held-item lighting from Low through Ultra.
- Opaque lava surfaces and dense in-lava visibility absorption.
- Rebuilt underwater scattering, caustics, motes, and sunlight curtains.
- Stabilized High/Ultra water reflections with water self-hit rejection,
- Reworked obsidian into a restrained dark clear coat and removed the duplicate
### Rift for 1.20.1-1.20.6
- Regional river, jungle, swamp, and ocean water with smooth biome transitions.
- Full tempest lighting: advancing storm clouds, stronger weather fog, wet
- Shadow-map volumetric godrays on High (8K) and Ultra (16K).
- Enhanced Minecraft water reflections at High/Ultra Water Quality.
- Colored held-item lighting from Low through Ultra.
- Opaque lava surfaces and dense in-lava visibility absorption.
- Rebuilt underwater scattering, caustics, motes, and sunlight curtains.
- Stabilized High/Ultra water reflections with water self-hit rejection,
- Reworked obsidian into a restrained dark clear coat and removed the duplicate
The first version (but now ported on 1.21.1-1.21.8). Check out description for info.
This is the first version. Please check out description for info.