Gid wrote on 7/12/2022, 9:31 PM

@DanielShacks Hi, It's 3.30am here so i'm off to bed but read this link & share as much as poss, MediaInfo & full system specs mainly, then someone will help you, 👍

You could also share the file on Google Drive or another sharing site so people can try it out 👍

Magix Movie Edit Pro Premium, from 2004-ish - Latest version,
Vegas Pro/Post 19 (Latest build), HitFilm Pro,  
Boris Continuum, Sapphire, Silhouette Standalone + Plugin, 
Mocha Pro Standalone + Plugin, Optics,
Desktop PC Microsoft Windows 10 Pro - 64-Bit
AMD Ryzen Threadripper PRO 3975WX 3.5GHz 32 Core
Corsair iCUE H150i RGB PRO XT 360mm All-in-One Liquid CPU Cooler
RAM 256GB ( 8x Micron 32GB (1x 32GB) 2666MHz DDR4 RAM )
2x Western Digital Black SN850 2TB M.2-2280 SSD, 7000MB/s Read, 5100MB/s Write
(programs on one, project files on the other)
Graphics MSI GeForce RTX 3090 SUPRIM X 24GB OC GPU
ASUS ROG Thor 1200W Semi-Modular 80+ Platinum PSU 
Fractal Design Define 7 XL Dark TG Case with 3 Fans

I'm 53, I've been a UK joiner for 37yrs, apprentice trained & time served, I make videos about my work & post them on Youtube so that i can share what I've learnt over the yrs,

At the moment my filming is done with a Samsung Galaxy S21 Ultra 5G

RogerS wrote on 7/12/2022, 9:50 PM

MKV barely works in Vegas, try MP4. For better performance try keyframe interval to 1 and not 0 (auto).