I've been poking Vegas (pro & others) thru-out multitude of versions & haven't really gotten close to making the playback or other parts work faster or better.
SO THEN : what do you recommend changing in setting ..even in the hidden settings to make things goo faster?!
In the mean time here's my results on a few things:
> Preview quality - affects some playback speed quite well, but depends on codec being used. It usually helps in ~20% of the cases
> Enabling GPU acceleration for preview - GARBAGE, yes it helps a little, but even with 2080TI, or old gear, this feature causes way too many program crashes and never seem to be fixed. In Vegas 16 it was improved so it crashed LESS and was kind of useful, the random unexpected crashing that ruined notable amount of progress still causes distrust.
> Maxing out USED RAM : yes this is required, but to this day Vegas only supports only 32GB ram. While I have over 64GB that just...sits there!
> Maximum number of rendering threads : Very important, but if you have slow cores (like a threadripper that I have) it still fails to deliver frames in preview fast enough and only while rendering manages to gain a notable benefit...unless you use a non-multithreaded, non-GPU accelerated VFX/SFX etc.(in which case : enjoy the single-task paradime)
>Using SSD for editing : this reduces the latency for picking up files & frames from the file, but haven't tested how much it changes the preview performance or rendering (some early tests didn't yeld more than 5% change)
My rig:
CPU : Threadripper 2950x (stock)
Ram : G.Skill trident RGB 3200mhz (small ram timing change 16-18-18-18-30)
GPU : Inno3D 2080Ti (stock)
Used software : Vegas 9-16(current)
Example of my usual footage :
General Complete name : F:\LV3\2019-11-13 18-19-33-498.mp4 Format : MPEG-4 Format profile : Base Media Codec ID : isom (isom/iso2/avc1/mp41) File size : 2.41 GiB Duration : 10 min 25 s Overall bit rate mode : Variable Overall bit rate : 33.2 Mb/s Writing application : Lavf58.20.100 Video ID : 1 Format : AVC Format/Info : Advanced Video Codec Format profile : Main@L4.2 Format settings : CABAC / 3 Ref Frames Format settings, CABAC : Yes Format settings, ReFrames : 3 frames Codec ID : avc1 Codec ID/Info : Advanced Video Coding Duration : 10 min 24 s Bit rate mode : Variable Bit rate : 32.9 Mb/s Maximum bit rate : 2 000 kb/s Width : 1 664 pixels Height : 970 pixels Display aspect ratio : 1.715 Frame rate mode : Constant Frame rate : 60.000 FPS Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Bits/(Pixel*Frame) : 0.340 Stream size : 2.40 GiB (99%) Codec configuration box : avcC Audio #1 ID : 2 Format : AAC LC Format/Info : Advanced Audio Codec Low Complexity Codec ID : mp4a-40-2 Duration : 10 min 25 s Duration_LastFrame : -17 ms Bit rate mode : Variable Bit rate : 128 kb/s Channel(s) : 2 channels Channel layout : L R Sampling rate : 48.0 kHz Frame rate : 46.875 FPS (1024 SPF) Compression mode : Lossy Stream size : 9.45 MiB (0%) Default : Yes Alternate group : 1 Audio #2 ID : 3 Format : AAC LC Format/Info : Advanced Audio Codec Low Complexity Codec ID : mp4a-40-2 Duration : 10 min 25 s Duration_LastFrame : -17 ms Bit rate mode : Constant Bit rate : 129 kb/s Channel(s) : 2 channels Channel layout : L R Sampling rate : 48.0 kHz Frame rate : 46.875 FPS (1024 SPF) Compression mode : Lossy Stream size : 9.63 MiB (0%) Default : No Alternate group : 1