Caching/Speeding up viewing while compositing

I read both the Fusion ref manual and the DR ref manual and I cannot figure out how to speed up the viewing of a comp such that it plays close to 25fps and not a low rate like 5fps.

1) I have tried right-clicking on nodes to render cache to a local drive BUT I don’t know which node is actually the bottleneck, or whether it’s a number of nodes. Either way, I have not been successful at using this approach.

2) In Project Settings- Optimized Media, I’m unclear whether Fusion processing can be improved by using Proxy Media, Optimized Media, Render Cache … UGHH!!!! I do not understand the connection between any of these and Fusion processes.

Can someone point me to a reference that explains all of this with regard to Fusion? My hope is to optimize my compositions such that they may be at a lower quality but at a frame rate closer to real time.

Thank you

You can right-click next to the Play controls and disable the High Quality and Motion Blur and enable Proxy. You can then go to the Fusion Settings under the top Fusion menu and enable Update All and raise the Standard Ratio to say 10 or 12:1. Also on the Edit page, try right-clicking on the clip and choose Render Cache Color Output, and make sure you have Fusion Memory Cache on under the Playback menu.

Thank you be unfortunately that didn’t work well. I am still getting about 3 fps even after it playing through multiple times.

I set it back to the default settings. It’s weird. I’ll have it loop through many times and sometimes it hovers around 3 fps and occasionally at 25 fps. Some nodes are blinking green at times. One would think that Fusion would proxy after playing through such that subsequent cycles would be a full speed.

I can find no information in the manuals that describe the Fusion Settings either.

All of this is quite frustrating. Sure, I can render it out as a new clip and bring it in but that is so counter-productive.

Please assist, thank you

Are there any expressions or scripts in your comp? That can have quite a bit of impact on Fusion's ability to cache nodes.

Are there any expressions or scripts in your comp? That can have quite a bit of impact on Fusion's ability to cache nodes.

Sander, no there are no expressions.

Can you share a screenshot or the nodes? How far is your RAM filled up? Fusion in Resolve gets less RAM allocated by default than Fusion standalone, so maybe that's something to look into.
It's always a bit hit and miss trying to figure this out.

Absolutely, I can share everything as it’s only a test comp. I’ll provide all of it in a few hours.

Regards

Hi Sander,
I have attached the comp.
The 2 media files used are at:
https://drive.google.com/drive/folders/ ... sp=sharing


They should both be available in a minute or two.

Hi Doug,

You can't attach a comp in this forum for whatever reason. If it's a simple one, you can just copy/paste it between the 'code' tags directly in your message, or you can also put it on your google-drive which will work fine as well.

Ahhh ... the comp is now on the Google Drive

Hm... I am om Windows so it's a bit of comparing Apples vs Orange, pardon the pun.
But on my i9 with 64GB of memory and a 3090 with 24GB Video RAM everything caches the way it's supposed to. After a bit of a render I get a consistent 25 fps playback on my system.

This is of course not what you're looking to hear, but in itself the comp is fine.

Although my timeline setting is Full HD instead of 4K - that could be a factor. What are your project settings?


But it is almost maxing out the maximum allocated memory while playing back. The cache indicator at the bottom right consistently hovers at about 48% i.e 28-30 Gb of RAM. What does it say on your system?

I don't know how Fusion deals with this internally, but maybe since you're connecting a couple of things to each other Fusion tries to keep the images of the tracker and the transform etc all in memory at the same time?

Hey, did I mention that I was an idiot?
I had my Timeline set to 24fps while the clips are at 25fps.
Can you please check your Timeline and verify that yours is at 25fps?
I'm sure that was the problem as DR is trying to "ram" 25fps into a 24fps timeline.


(There should be an "idiot" checkbox like, "Are you an idiot, Y or N?" If yes, then verify the frame rate of the clips vs the timelines.)

My timeline is at 25 fps

My timeline is at 25 fps

Sander,
Thanks for helping me work through this.

Doug