As far as I know there is no huge benefit setting the priority higher on both low end and high end systems.
I did a test with systems that have following specs:
“low end”:
i7 4770k @ stock
2x8GB DDR3 @ 1600mhz (stock)
nVidia GeForce GTX 970 4GB @ stock
Z motherboard (not OEM)
SATA SSD 500GB WIN 10
SATA SSD 1TB (videos)
“high end”:
i7 11700k @ stock
2x16GB DDR4 @ 3200mhz (stock)
nVidia GeForce RTX 2080-TI 11GB @ stock
Z motherboard (not OEM)
SATA SSD 500GB WIN 10
SATA SSD 1TB (videos)
The “low end” PC took rendering a video with a lot of filters (procceding “melt” as normal priority) about 15:23 mins, as Shotcut says.
The “low end” PC took rendering a video with a lot of filters (procceding “melt” as real time priority) about 15:01 mins, as Shotcut says.
Meanwhile the “high end” PC took rendering a video with a lot of filters (procceding “melt” as normal priority) about 3:21 mins, as Shotcut says.
The “high end” PC took rendering a video with a lot of filters (procceding “melt” as realtime priority) about 3:19 mins as Shotcut says.
On both systems the preview, whether the priority of the proccesses of Shotcut were set to normal, high or realtime were well above 24fps all over the time, which I think is the standard intger for previews in editing software.
But something I do not know about is the proxy option.
I have never heared of it before and as you mentioned it, I searched for it in the world wide web:
"Proxy editing is the process of creating and using low resolution videos and images in places of the original or optimized (Convert to Edit-friendly) files. This provides the advantage that your computer has less work to do in realtime while editing: decoding, scaling, and effects. This is, quite simply, because there are less pixels to compute. Then, when you are ready to export, it will use the original (or optimized) files for full quality.
Performance is optimal when the preview resolution matches the files it is working with. So, this feature is designed to work in conjunction with Preview Scaling . You can still use the proxy mode without Preview Scaling, however, in case something is not working absolutely correct with Preview Scaling." - Shotcut Documentation
If you are interested in having a better performance you can choose to render the video preview at lower resoulitons. To do that, go in Shotcut to “settings” → “preview scaling” and from there you can choose which resolution you would like to have your preview.
Also check, if your export settings are being set correctly when using the preview scaling option.
To do that, go to “export” → “advanced” and there make sure the “use preview scaling” option is disabled. If it was enabled, Shotcut would render at the preview resolution leading to worse visual quality.
Sorry for my bad english.
I hope I could help.
greetings
No_Names