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MisterAdvent
Inspiring
February 9, 2026

New Mask Agonizingly Slow

  • February 9, 2026
  • 1 reply
  • 40 views

I’m using new mask on an hour long clip that’s nested in a multitrack.  It’s inserting slides on a screen. Unfortunately, audience members heads encroach the screen area just a bit, so I have them masked in a sandwich timeline (base video | slides | masked video (copy of base)). It looks great, but when I go to the multitrack, it’s sluggish as all get out.

So I decided to render the sandwich timeline, and it says it’ll take 12 hours to render. It’s all CPU rendering, and the CPU is only being used 35%. 1-2% activity on the GPUs, and disk write speed of about 1.3KB/s.  I noted that tracking the mask over the one-hour timeline took almost 4 hours.

This is not acceptable.


 
System info
    Application: Premiere Pro (Beta) v26.2.0.18
    OS: Windows v10.0.26200, RAM: 63.79 GB GB, CPUs (logical): 16

    1 reply

    FlyingFourFun
    FlyingFourFun
    Inspiring
    February 12, 2026

    I see you are using Build 18, which had a bug with GPU enablement.  You have to be at version 21 and newer.  There is a good chance the speed issue is the lack of GPU enablement, and not the mask process itself.   Suggest you try build 21 + and confirm.

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