Recommendation:

For the best experience, I strongly recommend playing without shaders. This modpack is built to shine with its subtle visual enhancements and performs best without additional shader effects.

To fully enjoy the intended visual style, I also suggest using the following resource packs:

Key Features:

Performance & Optimization
With Sodium, Lithium, Krypton, Bobby, Dynamic FPS, Entity Culling, and C2ME, the game runs smoother and more efficiently - even in large worlds.
Visual Enhancements
Enjoy a more atmospheric world thanks to Iris Shaders, LambDynamicLights, Simple Fog, Smooth Sky, Explosive Enhancement, Particular, Particle Rain, Dark Loading Screen, Visuality, Falling Leaves, NotEnoughAnimations, and Better Clouds.
Sound Overhaul
The soundscape is noticeably improved with Sound Physics Remastered, Sounds, Immersive Thunder, Presence Footsteps, and Ambient Sounds
Interface Improvements
Mods like BetterF3, OptiGui, Better Statistics Screen, Legendary Tooltips, Reese's Sodium Options, Cherished Worlds, Dark Loading Screen, World Play Time, and Mod Menu provide better information and accessibility.
Convenience & QoL
Improve your gameplay flow with Mouse Tweaks, Shulker Box Tooltip, Toggle Item Frames, Lightweight Inventory Sorting, Stack to Nearby Chests, and Creative Fly.
Exploration & Tracking
Keep track of your journey with Xaero's World Map.

Full list of mods:

Just Slightly Better