Those producing times seem about right. Producing most kinds of videos usually won't push your system to its limit, especially at such low resolutions as 720.
I just ran a test on PD365 with a similarly sized source clip (AVC 1.4GB, 18m 48s duration, 10Mbps bitrate HD 30p) and it took 1:58 to produce using hardware encoding to 1280x720/30p AVC MP4. The CPU usage was 15% and GPU usage was around 68%.
In PD17, the same test used the same CPU percentage but slightly lower GPU resources (59%) and it took almost 40 seconds longer to produce (3:36), which suggests that PD365/20 is better suited to your modern hardware and Win11 than PD16 is.
If you wanted to pack your project and upload it to Google Drive or OneDrive, I'd be happy to run the same comparison on my system. See this
FAQ for more details. If instead you'd like to try the same clip I used, you can download it from
here.
You may also want to try the free version of PD365 or PD20. Since you're only working with HD clips and producing to 720, you shouldn't run into any of the trial version limitations and will hopefully see an improvement in producing time.
YouTube/optodata
DS365 | Win11 Pro | Ryzen 9 3950X | RTX 4070 Ti | 32GB RAM | 10TB SSDs | 5K+4K HDR monitors
Canon Vixia GX10 (4K 60p) | HF G30 (HD 60p) | Yi Action+ 4K | 360Fly 4K 360°