Sony Vegas laggy preview

Solution
Have a look at some possible solutions here.
https://www.moviestudiozen.com/free-tutorials/sony-movie-studio-platinum/252-preview-lag-in-sony-vegas

You're running an older quad core that doesn't compare to newer i5's in terms of power. It may depend on your settings and you may not be using gpgpu acceleration for the preview. As stated if you're working with compressed video formats it makes it that much harder for an already older cpu.

Also if you're working with a single drive system it may be the drive creating some of the bottleneck. If it has to read a source video from the drive and output to the same drive it's limited by the data throughput to that drive. Having one drive for source media and a separate physical drive for the...
Have a look at some possible solutions here.
https://www.moviestudiozen.com/free-tutorials/sony-movie-studio-platinum/252-preview-lag-in-sony-vegas

You're running an older quad core that doesn't compare to newer i5's in terms of power. It may depend on your settings and you may not be using gpgpu acceleration for the preview. As stated if you're working with compressed video formats it makes it that much harder for an already older cpu.

Also if you're working with a single drive system it may be the drive creating some of the bottleneck. If it has to read a source video from the drive and output to the same drive it's limited by the data throughput to that drive. Having one drive for source media and a separate physical drive for the output media may help reduce some of that bandwidth issue.

Video editing is a pretty intensive task regardless which program you use. If you're able to edit video then your pc is 'good enough'. If you'd like to edit/render faster then you'll need better hardware to get that performance. "Good enough" and "good" are subjective terms and don't necessarily mean the same thing. A golf cart is good enough to get to the grocery store though I'm sure a car with higher speed and more room to carry groceries would be exceedingly better by comparison.

This shows rendering with an i7 vs an i7 + r9 290 dedicated gpu.
http://www.tweaktown.com/articles/6489/exploring-sony-vegas-pro-13-rendering-with-a-visiontek-radeon-r9-290/index5.html

Not a completely revealing benchmark but gives some idea. It's hard to compare such an old cpu to a newer one with all the platform and os changes. Here's the q6600 (similar to yours) compared to a modern locked i5.
http://www.anandtech.com/bench/product/53?vs=1646

To be fair that cpu is 9yrs old and has probably lived its useful life for most things.
 
Solution