From a few quick tests on my laptop, there were a few things I noticed:

1. Cinelerra-GG handles supprisingly well on moderate hardware
2. Cin transitions between different files with ease, but has more trouble transitioning between two edits from the same file (not just with my heavy recordings either, even a small YouTube video seems to have this issue).
3.The Arch package needs to be rebuilt, I just updated my laptop and libvpx is now at version 6, while Cin-GG is looking for version 5 (had to symlink to get it to launch, seems to work fine)

So while Cin plays the files with relative ease, and can even playback at double-speed or backwards without much issue, actually cutting to a different part of the video seems to slow it down. Perhaps it has trouble seeking within the same file for two different positions at once?

On Fri, Mar 8, 2019 at 12:08 AM, ben@innovationplex.com wrote:
Sorry for my late reply to this thread, been busy this week.

My tests show that with the screen captures recorded with OBS (most recent one is 20mb/s at 1080p60, h.264 in a FLV container) have trouble transitioning. Hard cuts fair slightly better, but still present some slowness. I'll conduct more tests with different files, as well as on my laptop (which is running a straight SSD, unlike my desktop which runs the SSD as a cache device for a hard drive using bcache).

Compiling latest git did not show any improvement (even with -O2), and I use the official cin-gg package for Arch Linux normally.

On Sun, Mar 3, 2019 at 8:17 PM, Phyllis Smith <phylsmith2017@gmail.com> wrote:
Andrea, I think I might have confused the problem when your computer was acting strangely or when you reported the mkv slowness.  Anyway, from the information you provided and the dropbox transition.mp4, it looks like transitions are working as expected with your normal installation.  Thanks for checking, gg/pys

With my normal installation I have the following results:

https://www.dropbox.com/s/h8p4tyvx2snwiyi/transition.mp4?dl=0

I summarize the results:

mp4 --> wipe --> png --> dissolve --> 3gp/cut/3gp --> slide --> mp4
 30      29       29      21 (png?)    30  28  30       29       30 Fps

I can tell I don't have any particular problems.