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