You have four fast cores with a relatively small buffer and 8 GB of RAM per core. I don't know how well your mobo can move image data to/from that CPU core.
Your webcam recordings ... probably long-GOP, I'm expecting they put a huge read/write demand on your system, though you don't include what the media is, and what disc/connection is used for that in your computer.
Next, on-board graphics and dedicated GPUs are not the same thing. On-boards are designed to off-load some CPU workloads as a helper which dedicated GPUs do not. So they don't work exactly the same within the system.
Last, the work you list doesn't seem to involve much if anything from the GPU Accelerated Effects List, so that 1080 is not used heavily. The onboard graphics gets more use on account of its absorbing some CPU workload.
I'm wondering about your media and your disc setup.
The problem it's that when i start the export process...the used resources they are not what I would expect
I believe your expectations are in error. PP does what it does with the resources available.
Hi Neil, thank you for the help.
Typically the project file and the footage file are saved in my desktop, so in a Samsung NVMe SSD 960 EVO connected in the M2 port of the motherboard (Asus Prime B250 Plus).
Instead the background image (.psd), the logo file (.psd) and the intro (.aep) are stored in a 500Gb HDD (SATA).
Here one example of my typical footage: footage.mp4 - Google Drive
And here the result of the edit with some typical transitions: edit.mp4 - Google Drive
Using a standard SSD for OS/programs is entirely satisfactory, and saving the m.2 drive for project files, cache & previews, with a third internal SSD for media works well.
Of course, not all mobos move data wisely. Depending on what shares what lanes, there can be issues there also.
Which is why places like Safeharbor Computing and Puget Systems test so many but use so few.