Underwhelming performance Khadas Vim2 Max in video rendering kdenlive

I use this file on every sbc.
https://www.dropbox.com/s/i7eqsi0ktuno4wg/BenchProject.tar.gz?dl=0
Open Kdenlive, click open. Select Archived project instead of Kdenlive project(file type). Go to the place you’ve downloaded it and double click it. It will ask where to extract. Choose a folder, it will say Can’t create this folder. Don’t worry, it’s because it already excists. Then you’ll probably see Clip Problems. Click search recursively, and go to the place you’ve unpacked the files. Click Ok.
The project is opened, don’t browse thru the project before clicking on render, else everything will be loaded in the Ram.
So click, Render. There you choose the amount of threads you want to use. I always do the render in H.264/AAC (CBR), bitrate 4000, audio bitrate 160. All these settings should allready be ok.

That’s it. Then it’s a long time waiting.
Thank you very much.

p.s.: To check the cpu temp I wrote this program. You’ll probably have something better, but you never know it’s useful.
https://www.dropbox.com/s/8a0d2zf2c79xk9m/TempCheck.c?dl=0