[Preview] Rot/Scale vs. Pos/Size filter

[Earlybite]

OS: Linux Mint 19.3 Cinnamon
Shotcut: 20.04.05

Hi!

[Preview] Something strange…?

If I use Rot/Scale this part has a FPS of 1 per sec. with PreviewScaling 360 (no joke!), with None 1 Frame per 3 sec. …

If I use Pos/Size that part is smooth (with PreviewScaling 360)…

I know that this info is very small, but I really do not know where to start, so I started with this.

Best regards

O, btw: Happy Easter!

[Earlybite]

OS: Linux Mint 19.3 Cinnamon
Shotcut: 20.04.12 (Portable TAR)

Is there something in work, because of that issue?

Here one more simple example:

Simple-Mask filter plus Rot/Scale is currently an absolutely NoGo (1 frame each second<!>), as soon as you use keyframes with Rot/Scale…
The same, but with Size/Pos filter, is smooth…
Preview-Scaling doesn’t matter…

-----------------------EDIT---------------------
In addition:
I’ve just loaded a previous save with Pos/Size filter and I have heavy stutter…
And that saved project was smooth in the preview!
++

TIA and
best regards