David,
Just one quick thing for you to try though.  Timing and thus speed is determined by the audio.  Recently a Debian 10 user reported that when he had Settings->Preferences, Playback A set to PulseAudio, it was slow.  He switched back to Alsa, and then it was OK.  Phyllis

On Fri, Apr 24, 2020 at 12:47 PM david <brometeo@gmail.com> wrote:
El viernes 24 de abril, Phyllis Smith escribió:
> Any further specific information you can provide may help us solve a
> problem so we appreciate it.  Phyllis/gg

Hi, Phyllis.

Sorry for my lazy message. I use Debian Testing. When I write about slowness is
because it is very slow. When I click on a video piece it can go 1 second until
it is red coloured indicating it is selected. If I move the piece in timeline,
trying to join to another piece, for example, movement is very sluggish and
clunky. Perhaps I can record a video from my desktop for your evaluation.

Thank you and don't worry for now. I see it is very important I am much more
precise about this issue :D

--
David
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