for me only obvious positive difference comes from increasing cache from 256 mb to 2048 mvb
but I am on 32-bit cin + 64 bit Linux kernel (5.1.12)
I tried with single 1080p 24 fps vp9 video as downloaded from youtube. With default 256 mb cache reverse playback stutters a lot. With 512 it stutters less. With 2048 mb it stutters only ocassionally.
Changing preroll renders from 0 to 100.0 does not change things for me.
On Tuesday, May 3, 2022, Phyllis Smith via Cin <
cin@lists.cinelerra-gg.org> wrote:
That is quite a discovery. Hopefully, I can find time today to test that as I have a really slow laptop and a decent faster laptop.
Maybe that is what makes the difference. OR it could just be 0.5 seconds is leftover from the really old days.
One thing that has always bothered me is that in the transition from
an 11 year old notebook to a mid-to-high level PC, playback and
especially reverse playback always suffered from the same lags and
framerate drops. There wasn't the improvement I expected. In the
Preferences > Performance tab, I tried increasing the "Cache size"
from 256MB (default) to 4096MB without noticing any change (I have
32GB of RAM). I never touched the "Seconds to preroll renders" option,
which by default is 0.5 seconds. Now I've tried to set it to 1.0s and
the improvement in playback and reverse playback is EVIDENT!
If anyone feels like trying to take a problematic project in timeline
and increase the preroll time and then report the results, it would be
a favor to me. If the improvement is also confirmed by others I will
immediately put the tip in the manual, because it seems very important
to me.
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