Did you try reencoding the source video with a tool like ShutterEncoder?

Gonna be completely honest I have no idea what that is so no, I use OBS studio to record stuff

I think it would help if we know what type of video you are putting on your timeline. You mentioned you recorded a video, with what, and what are the settings?

https://www.vegascreativesoftware.info/us/forum/best-obs-recording-settings-for-vegas-pro--140906/

Did you try reencoding the source video with a tool like ShutterEncoder?

Gonna be completely honest I have no idea what that is so no, I use OBS studio to record stuff

It's a free tool you can use to convert problematic footage, give it a try (convert to- editing codec- h264 for starters and in advanced settings limit the GOP to your framerate (30, etc.))

For OBS try known good settings like limiting the keyframe interval to 1 instead of 0. If you are using MKV you can have OBS remux it to MP4 which works well in VEGAS.

I think it would help if we know what type of video you are putting on your timeline. You mentioned you recorded a video, with what, and what are the settings?

The AMF/FFmpeg is

MaxNumRefFrames=4 BReferenceEnable=1 MaxConsecutiveBPictures=1 BPicturesPattern=1 HighMotionQualityBoostEnable=1 EnableVBAQ=false

Not really related but i used GTX 1080Ti and RTX 3070 with almost the same settings, aka different video encoder but everything else is the same and it still lags, and yes I do remux all my recordings to have the audio tracks separated

Did you try reencoding the source video with a tool like ShutterEncoder?

Gonna be completely honest I have no idea what that is so no, I use OBS studio to record stuff

It's a free tool you can use to convert problematic footage, give it a try (convert to- editing codec- h264 for starters and in advanced settings limit the GOP to your framerate (30, etc.))

For OBS try known good settings like limiting the keyframe interval to 1 instead of 0. If you are using MKV you can have OBS remux it to MP4 which works well in VEGAS.

Will that make the quality worse? Because I really dont want that

Update: I think its a matter of HEVC codec, Im using the VEGAS PRO 19 Steam Edition, the new questions becomes should I buy the vegas pro 22 (not steam edition)? Would that new version have better playback for HEVC codec? If so, will it be like 100x better? Its on sale right now and I do got enough to buy it.

Yes, I refuse to just use AVC because my space are quite limited, I did just now try to record using AVC and my GPU just dies.

@FelixIsTaken you can download the trial version and see how it goes.

@FelixIsTaken you can download the trial version and see how it goes.

Still laggy but is much better at times, though im pretty flabbergasted that the 6900XT are unable to decode HEVC smoothly, you think the Pro Edition driver will help?

@FelixIsTaken I have no idea if the pro drivers will help with decoding HEVC. @Howard-Vigorita has the same card I believe. He would be a better source of information on what it can and cannot handle within Vegas Pro.

Did you try reencoding the source video with a tool like ShutterEncoder?

Gonna be completely honest I have no idea what that is so no, I use OBS studio to record stuff

It's a free tool you can use to convert problematic footage, give it a try (convert to- editing codec- h264 for starters and in advanced settings limit the GOP to your framerate (30, etc.))

For OBS try known good settings like limiting the keyframe interval to 1 instead of 0. If you are using MKV you can have OBS remux it to MP4 which works well in VEGAS.

Will that make the quality worse? Because I really dont want that

No, it won't if you take care with the settings.