For me it also makes a difference and it should be put into the manual for sure as a possibility on some computers. I assume it is based on the speed to get to the disks?? And there is probably a "sweet spot" for anyone's specific system.
Here are my observations but not totally scientific based on 64-bit Fedora 31/32. Input File: Big Buck Bunny with Video Effect brightness/contrast applied; Play every frame enabled (I got different results when not Play every frame). *HP slow laptop* Forward Framerate Achieved = 32 for .5, 1.0, and 2.0 seconds. *0.5 *seconds Reverse Framerate Achieved average = *15* and varied from a low of 9 to a high of 18 *1.0* seconds Reverse Framerate Achieved average = *18 *and varied from a low of 15 to a high of 23 -- playing seemed moe consistent 2.0 seconds Reverse Framerate Achieved average = 17 and varied from a low of 13 to a high of 23 *AMD gaming laptop* Forward Framerate Achieved = 60 for .5, 1.0 and 2.0 seconds. * 0.5 *seconds Reverse Framerate Achieved average = *32* and varied from a low of 19 to a high of 40 *1.0* seconds Reverse Framerate Achieved average = *36 *and varied from a low of 28 to a high of 42 -- playing seemed moe consistent 2.0 seconds Reverse Framerate Achieved average = 35 and varied from a low of 30 to a high of 43 On Tue, May 3, 2022 at 2:18 AM Andrea paz via Cin < [email protected]> wrote: > 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. > -- > Cin mailing list > [email protected] > https://lists.cinelerra-gg.org/mailman/listinfo/cin >
-- Cin mailing list [email protected] https://lists.cinelerra-gg.org/mailman/listinfo/cin
