Here’s a breakdown of what might be happening:
Why the difference in speed?
Fusion, being a node-based compositing tool, is heavily reliant on both the CPU and GPU, but it tends to be more CPU-intensive, especially for complex effects and titles. When rendering Fusion compositions, DaVinci Resolve is likely utilizing more of your CPU and system memory (RAM) to process the effects, which can slow down the overall framerate. On the other hand, rendering standard footage (without Fusion effects) relies more on the GPU for color grading and processing, which is why you see a significant increase in speed during those parts.
Hardware usage during different tasks:
You’re correct in noticing that DaVinci Resolve uses different parts of the hardware depending on the task. Fusion-heavy workloads stress the CPU and RAM more, while standard footage rendering leans heavily on the GPU. This is why you’re seeing a bottleneck when Fusion is involved, as your CPU might not be keeping up with the demands of the Fusion nodes.
Recommendations for your new build:
For a new PC build, you’ll want to balance both CPU and GPU power. Since Fusion is CPU-intensive, a high-performance multi-core CPU (like an AMD Ryzen 9 or Intel Core i9) would be ideal. For the GPU, having a powerful GPU (or even two) with ample VRAM (GDDR6
https://serverorbit.com/gpu-and-graphic ... /gddr6-gpu or better) will significantly improve performance, especially for 4K and higher resolutions. Look for GPUs like the NVIDIA RTX 3080/3090 or AMD Radeon RX 6800/6900 series, which offer excellent performance for DaVinci Resolve.
Additionally, ensure you have fast storage (NVMe SSDs) and plenty of RAM (32GB or more) to handle large projects and high-resolution footage smoothly.
Hope this helps with your new build planning!
Best,