Sluggish timeline video playback, fast PC

Jarrod-Fegley wrote on 1/27/2026, 7:21 PM

I have an intel i914900k, 96 gb ddr5 ram, samsung ssd 990 hard drives, and asus rtx 5070ti 16gb graphics card. I am using 3840 x 2160 25fps footage with and all-i codec? Shot from a dji mavic 4 pro. The vegas template for the project is 1080p because Vegas would seriously choke on a 3840 x 2190 timeline. The issue now is, vegas still stutterers a lot during playback on the timeline with a DRAFT preview screen. Dynamic RAM previews are really slow as well. It stutters even more when there is a simple cross fade transition. How to fix this performance issue?

Comments

RogerS wrote on 1/27/2026, 7:25 PM

Could you share more information about the DJI Mavic footage? MediaInfo would be great; a sample on a file sharing site even better.

I have similar hardware to you and would be happy to try it.

In general you should be able to edit it in best/full at 4K on a system like this. The fade might be an exception with VP 23 as fading events into each other now hurts performance (with a copy of the media performance is better- so fade media a to media b instead of a-a).

If preferences/ file io are not on default settings please return them to defaults with the 5070 doing decoding.

Jarrod-Fegley wrote on 1/27/2026, 11:30 PM

https://1drv.ms/v/c/822e793e3877bece/IQB5rduGw3PbTrydiACJYIwmAWMduJ09jK-JlEPlsun19iQ?e=CIjPeo

I am on Vegas 22, I am starting to think that the GPU is not working. But I know Vegas sees it.

RogerS wrote on 1/27/2026, 11:54 PM

I just opened 22.250 with my laptop (RTX 4060). On an 8-bit preview at best-full I'm getting a solid 25fps. Overlap two clips and it plummets.

Is the GPU working? No because this footage doesn't work with any GPU decoding in VEGAS. See the MediaInfo below; 10-bit 422 AVC is the problem. 10-bit 422 HEVC would work with an Intel iGPU. 10-bit 420 AVC would work with an NVIDIA or other GPU.

General
Complete name                  : \DJI_20251005134106_0199_D.MP4
Format                         : MPEG-4
Format profile                 : Base Media
Codec ID                       : isom (isom/iso2/avc1/mp41)
File size                      : 5.76 GiB
Duration                       : 3 min 12 s
Overall bit rate mode          : Variable
Overall bit rate               : 257 Mb/s
Frame rate                     : 25.000 FPS
Encoded date                   : 2025-10-05 17:41:06 UTC
Tagged date                    : 2025-10-05 17:41:06 UTC
Writing application            : DJI Mavic4 Pro L3B
Cover                          : Yes
Cover type                     : Cover
snal                           : (Binary)
tnal                           : (Binary)

Video
ID                             : 1
Format                         : AVC
Format/Info                    : Advanced Video Codec
Format profile                 : High 4:2:2 Intra@L5.2
Format settings                : CABAC / 1 Ref Frames
Format settings, CABAC         : Yes
Format settings, Reference fra : 1 frame
Format settings, GOP           : N=1
Codec ID                       : avc1
Codec ID/Info                  : Advanced Video Coding
Duration                       : 3 min 12 s
Bit rate mode                  : Variable
Bit rate                       : 250 Mb/s
Width                          : 3 840 pixels
Height                         : 2 160 pixels
Display aspect ratio           : 16:9
Frame rate mode                : Constant
Frame rate                     : 25.000 FPS
Color space                    : YUV
Chroma subsampling             : 4:2:2
Bit depth                      : 10 bits
Scan type                      : Progressive
Bits/(Pixel*Frame)             : 1.208
Stream size                    : 5.61 GiB (97%)
Encoded date                   : 2025-10-05 17:41:06 UTC
Tagged date                    : 2025-10-05 17:41:06 UTC
Color range                    : Limited
Color primaries                : BT.709
Transfer characteristics       : BT.709
Matrix coefficients            : BT.709
Codec configuration box        : avcC

Other #1
ID                             : 2
Type                           : meta
Format                         : djmd
Codec ID                       : djmd
Duration                       : 3 min 12 s
Bit rate mode                  : Variable
Stream size                    : 1.57 MiB (0%)
Title                          : CAM meta
Default                        : No
Alternate group                : 5
Encoded date                   : 2025-10-05 17:41:06 UTC
Tagged date                    : 2025-10-05 17:41:06 UTC

Other #2
ID                             : 3
Type                           : meta
Format                         : dbgi
Codec ID                       : dbgi
Duration                       : 3 min 12 s
Bit rate mode                  : Variable
Stream size                    : 112 MiB (2%)
Title                          : CAM dbgi
Default                        : No
Alternate group                : 5
Encoded date                   : 2025-10-05 17:41:06 UTC
Tagged date                    : 2025-10-05 17:41:06 UTC

Image
Type                           : Cover
Format                         : JPEG
Muxing mode                    : moov-meta-covr
Width                          : 960 pixels
Height                         : 540 pixels
Color space                    : YUV
Chroma subsampling             : 4:2:0
Bit depth                      : 8 bits
Compression mode               : Lossy
Stream size                    : 247 KiB (0%)