Timeline running slow with FX add on's...

What is in the Computer that is responsible for running a smooth and consistent Timeline in Resolve and be able to handle from 4k up to 6k?

Four things.

CPU
GPU
Memory
Storage

Four things.

CPU
GPU
Memory
Storage

I have Ryzen 7, would it make a difference only upgrading to the Ryzen9?
I have an ASUS Prime B350 Motherboard, so Im guessing it can handle a Ryzen 9 from Ryzen 7?

You don't mention your GPU, which is a component that Resolve is needing a lot.

I prefer Intel. I can't answer AMD questions.

You don't mention your GPU, which is a component that Resolve is needing a lot.

oops... still learning

It's a Sapphire 8GB
Radeon RX 56

I guess this GPU should be upgraded first?

Not necessarily. We first need to know your sources. If they are highly compressed you'll need to upgrade Resolve to Studio first.
I suppose your GPU is a 560 if that was ever built with 8 GB VRAM.

Not necessarily. We first need to know your sources. If they are highly compressed you'll need to upgrade Resolve to Studio first.
I suppose your GPU is a 560 if that was ever built with 8 GB VRAM.

I have Resolve Studio version (paid 300)

OK, get a high-end Nvidia GPU then (if you can find one).

OK, get a high-end Nvidia GPU then (if you can find one).

Are they sold out everywhere?

The new ones are.