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It slows rendering down. Only enable/disable when you need to use it. I purge every frame when i use it.
In so many words: If you experience no render problems due to running out of memory, leave the option untouched. If you still wanna use it, then use "reasonable" values. It's better to empty the buffers every 5 frames than doing so for every frame. It may even make more sense to use higher values, but that realyl depends on the project type. Also note that some effects will cause the exact opposite effect with this kind of setting and make rendering less stable. In particular any temporal effects that look forward or back in time will have problems.
I have no render problems,so will leave it untouched.
Thank You David and Mylenium.
You will have render problems if you have minimal RAM And you try to render 5000 x 5000 images in there. It is a great hidden feature to know about.
I purge every frame when I use it also. It does slow down rendering so don't forget to turn it off when you don't need it.
There's a reason that this exists.
There's a reason that it's secret.
Hey mister Todd,You are right,but I am working for KGB.Do not tell anybody,please.