Hi,

I on the contrary have always been impressed by vegas' preview speed. Instantaneous as far as I'm concerned.

I now edit 4K on a 5K monitor, use 4K preview and there's no lag whatsoever. I throw footage acceleration, color grading, contrast, brightness, transitions at it and it's instantaneous. Always been a strength of Vegas.

I hear my GPU working hard (the fan spins when it reaches 60% usage so I really do hear it) and it's a high end AMD Fury X GPU so that probably helps a lot. But I really have not done any tweaking so indeed Nick's post is probably a good place to start if you don't own a high end GPU.

Thanks for the anwers. Xberk, Nick's post had already been on the original Vegas forum, it's more of a generic guide.

Bravof, I cannot quite imagine what you describe to be true. Maybe v14 has improved - but preview speed has been Vegas's achilles tendon for ages. I even bought a new PC in 2016 , 6 core i7 with 32 gig of ram and a Radeon r9-280, no improvement. As soon as there is grading, and a couple of things like sharpness and contrast, preview starts dropping to 14 fps or lower. A multicam project is almost only possible in low preview resolutions. The old forum was full of that subject.

Now, for comparison, EDIUS 8 handles tiltles plus heavily FXed previews without a glitch, it's just mindblowingly faster. It even allows you to use multiple cards. I always loved and defended Vegas against all NLEs out there - but preview is frustratingly prehistoric, especially when you need to show clients low res previews to give them a bad idea of the end result.

My biggest gripe has always been the terribly sluggish preview speed, and was wondering if that's been addressed in the meantime?

I found that playback rate hasn't changed significantly in the last 3 versions.

Like braveof I am also very satisfied with the Vegas 14 pro B252 preview speed - also for 4K media and/or projects.

My machine has an i7 4930 (6 cores) CPU and a RX480 GPU with the very newest drivers.

The monitors are a 40" UHD plus a 32" 2500x1600 side monitor.

You may use the AMD system monitor tool to see what your CPU and GPU usages are - maybe there is a bottleneck ?

Get the tool here: http://support.amd.com/en-us/kb-articles/Pages/AMDSystemMonitor.aspx

When previewing 4K media in a 4K project with the usual Levels- and other color correction the CPU usage is about 30% and the GPU usage is about 50-60%. Preview is a a steady 25 Fps (progressive).

When previewing 4K media in a 4K project with the usual Levels- and other color correction the CPU usage is about 30% and the GPU usage is about 50-60%. Preview is a a steady 25 Fps (progressive).

What about UHDp50 footage in a 3840x2160 project with Best(Full) Preview frame rates ?

Sorry, can't say: I have only UHD 3840x2160 at 25p / 100 Mbps (from Sony RX10 III and RX100 IV).

Why do some people always expect a preview with the same quality as the final result?

I wonder if the OP is previewing in 8 or 32 bit.

Why do some people always expect a preview with the same quality as the final result?

It is a must to preview in the same quality as the final result, at least for me and especially for color grading.

Why do some people always expect a preview with the same quality as the final result?

It is a must to preview in the same quality as the final result, at least for me and especially for color grading.

In full resolution and/or full framerate?

Why do some people always expect a preview with the same quality as the final result?

It is a must to preview in the same quality as the final result, at least for me and especially for color grading.

In full resolution and/or full framerate?

Both. If you only have 4K 30fps to work with, how much lower would you go with the preview frame rate?