File gopro11 2.7k 59fps ,setings vegas default,hardware i5 10400 2.9ghz,gtx3060 ram 16gb

Okay, we're sort of getting somewhere.

For the GoPro, what media is it creating (exactly what is it set to?) Best way to answer is with MediaInfo: https://www.vegascreativesoftware.info/us/forum/faq-how-to-post-mediainfo-and-vegas-pro-file-properties--104561/

For the hardware, does the i5 have an iGPU in use? Under preferences/ file io in Vegas is the hardware decoder set to Auto (Intel QSV) or NVDEC?

Is this a desktop computer? If there is an iGPU try enabling it in bios.

yes computer desktop,

CPU: Intel(R) Core(TM) i5-10400F CPU @ 2.90GHz   2.90 GHz

GPU: Geforce RTX 3060

RAM: 16gb

decoder auto

gopro mp4 2704/1520 59.94frames/second

What does auto say under decoder and what is the media specifically? Follow the link I pasted earlier.

General
Complete name                            : C:\Users\asjon\Desktop\gp\GX010025.MP4
Format                                   : MPEG-4
Format profile                           : Base Media / Version 1
Codec ID                                 : mp41 (mp41)
File size                                : 2.21 GiB
Duration                                 : 3 min 11 s
Overall bit rate                         : 99.5 Mb/s
Encoded date                             : UTC 2022-10-22 11:43:11
Tagged date                              : UTC 2022-10-22 11:43:11

Video
ID                                       : 1
Format                                   : HEVC
Format/Info                              : High Efficiency Video Coding
Format profile                           : Main@L6@Main
Codec ID                                 : hvc1
Codec ID/Info                            : High Efficiency Video Coding
Duration                                 : 3 min 11 s
Bit rate                                 : 99.2 Mb/s
Width                                    : 2 704 pixels
Height                                   : 1 520 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 59.940 (60000/1001) FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Bits/(Pixel*Frame)                       : 0.403
Stream size                              : 2.21 GiB (100%)
Title                                    : GoPro H.265
Language                                 : English
Encoded date                             : UTC 2022-10-22 11:43:11
Tagged date                              : UTC 2022-10-22 11:43:11
Color range                              : Full
Color primaries                          : BT.709
Transfer characteristics                 : BT.709
Matrix coefficients                      : BT.709
Codec configuration box                  : hvcC

Audio
ID                                       : 2
Format                                   : AAC LC
Format/Info                              : Advanced Audio Codec Low Complexity
Codec ID                                 : mp4a-40-2
Duration                                 : 3 min 11 s
Bit rate mode                            : Constant
Bit rate                                 : 192 kb/s
Nominal bit rate                         : 48.0 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                              : 4.31 MiB (0%)
Title                                    : GoPro AAC  
Language                                 : English
Encoded date                             : UTC 2022-10-22 11:43:11
Tagged date                              : UTC 2022-10-22 11:43:11

Other #1
ID                                       : 3
Type                                     : Time code
Format                                   : QuickTime TC
Duration                                 : 3 min 11 s
Bit rate mode                            : Constant
Frame rate                               : 59.940 (60000/1001) FPS
Title                                    : GoPro TCD  
Language                                 : English
Encoded date                             : UTC 2022-10-22 11:43:11
Tagged date                              : UTC 2022-10-22 11:43:11

Other #2
Type                                     : meta
Duration                                 : 3 min 11 s
Bit rate mode                            : Variable
Duration_LastFrame                       : -68

General
  Name: GX010025.MP4
  Folder: C:\Users\asjon\Desktop\gp
  Type: Intel HEVC
  Size: 2.32 GB (2,376,741,266 bytes)
  Created: Saturday, October 22, 2022, 10:11:23 PM
  Modified: Saturday, October 22, 2022, 10:12:27 PM
  Accessed: Sunday, October 23, 2022, 11:25:44 PM
  Attributes: Archive

Streams
  Video: 00:03:11.124, 59.940 fps progressive, 2704x1520x32, HEVC
  Audio: 00:03:11.081, 48,000 Hz, Stereo, AAC

ACID information
  ACID chunk: no
  Stretch chunk: no
  Stretch list: no
  Stretch info2: no
  Beat markers: no
  Detected beats: no

Other metadata
  Regions/markers: no
  Command markers: no

Media manager
  Media tags: no

Plug-In
  Name: mxhevcplug.dll
  Folder: C:\Program Files\VEGAS\VEGAS Pro 20.0\FileIO Plug-Ins\mxhevcplug
  Format: Intel HEVC
  Version: Version 1.0 (Build 8532)
  Company: MAGIX Computer Products Intl. Co.

Under Options - Preferences - File I/O tab, uncheck the "Legacy HEVC" option. Does that help?

problem same :(

Okay, we're getting somewhere. It's 60fps GoPro HEVC.

Under preferences / file io where you found the decoder, what does it say after auto? If Intel isn't a choice see if you can enable the Intel iGPU in the PC's bios.

Also, are you on the current build of Vegas Pro 20 (214)? If not try updating to that.

I sugges you build a Proxy for GoPro 60fps footage. That should be all you have to do; GoPro media is an acquisition format, and it was not made for efficient editing.

I also suggest going to the media window in Vegas, right-clicking and "create video proxy." 4K60 HEVC from a GoPro just isn't an easy format to play back.

Vegas is trial version new,but maybe doesn't work with h265 codec vegas?

Vegas is trial version new,but maybe doesn't work with h265 codec vegas?

It does work with that codec.
I can use more than 10 hours 4K HEVC 50p on the timeline.
Your hardware is too weak for playing without using a proxy.
Make a proxy as @Musicvid and @RogerS told you and play that with the preview setting "Preview/Auto".

Trial version should create proxy. Your CPU suffix F suggest no intel graphics. Just create proxies and edit with those. Just remember to switch back to full for final render. Once you establish a routine life gets simpler. You would probably have the same problem if you trialed Resolve (free)

Vegas is trial version new,but maybe doesn't work with h265 codec vegas?

It does work with that codec.
I can use more than 10 hours 4K HEVC 50p on the timeline.
Your hardware is too weak for playing without using a proxy.
Make a proxy as @Musicvid and @RogerS told you and play that with the preview setting "Preview/Auto".

Yes i use prewiev auto,but problem same,maybye can use h264 codec i try it

Which driverversion is used for the Nvidia, you can find it under Help/Check for Driver Updates?

Which driverversion is used for the Nvidia, you can find it under Help/Check for Driver Updates?

522 latest

To show you that is possible to play those files ( also without proxies) I 'll show you on my laptop from signature with Vegas Pro 20 latest build:

To show you that is possible to play those files ( also without proxies) I 'll show you on my laptop from signature with Vegas Pro 20 latest build:

Codec file you h265 ?

maybe because my demo version? My trial 20 editing this version

No, demo and full version are the same.

With poxy ok no lag