Important to keep in mind that VulkanMod is still in the alpha, so many mods are incompatible with it. But I will try to only include mods that work with Vulkan.
Better FPS is the best fps boost mod pack for absolute potato PCs I can confirm this because I have a pc with an I7 - 6600U, which is the oldest CPU that is currently supported by Microsoft/windows. I can guarantee you that you will get 60 FPS and more, and by that, I mean constant with no frame drops. This pack is built on VulkanMod it rewrites the render engine OpenGL to use the VulkanAPI.
Since I use it I've never got frame drops again your pc can lag and make his own stuff but something that will never lag is your frame rate.
So give it a try.
Check out my other projects on my profile