Fusion in Resolve 15 SLOW vs Fusion 9

Had a simple shot. Track the shot, create a 3D scene and add one image onto an image plane in the scene. In the new Resolve Fusion 15, every step of the process was tedious. Buttons were slow, turning things off/on was slow. The solve was slow, track was slow. And once the shot was done, I could not get it rendered out! I tried the disk cache, I tried the RAM preview but it ran out of RAM (I have 64GB system memory and 11GB VRAM), and even from the edit page, it took several times playing it to get it to chug through and cache it until the playbar was blue. And after that, it wouldnt play back faster than about 5 or 7fps. Couldnt play it back in fusion either. So I switched to Fusion 9, re-did the shot and everything was snappy. Things turned off/on instantly, and I could even connect and disconnect nodes during playback without interferring with the speed much. Without rendering it played back at about 15fps. It took just a few mins to cache up and it played back in real time. So my question is this -- why such a big difference in performance between Resolve 15's fusion and Fusion 9?

This *is* a beta version and I know that quite often, when I'm creating code that is not at a "release candidate" level, I include quite a bit of debugging stuff that can slow things down significantly. This extra code helps track down bugs if/when they appear so is fairly essential at this stage.

Also, I suspect BMD want to get things working properly first and *then* optimize them for speed.

Or I could be talking out my bottom

[Peter Chamberlain]

The Fusion integration will take a long time.. at NAB we said it could be 12-18 months... and every update is getting better.. speed is one item on the list but its also one of the longer engineering projects.

Peter,

I had a question in regards to the 12-18 month time span. Does that mean that Resolve 15 will remain in Beta that whole time or will only the Fusion tab?

[Peter Chamberlain]

It's just the Fusion integration which is the long project.

I have the same issue, I cannot seem to get anything to play in real time in fusion 15 Studio.
I have been trying different settings but can't seem to get that green line happening.
Just a basic HD file with a transform cannot play back.
Can anyone suggest the best settings as being relatively new to fusion I am hoping I am doing something wrong,... should I even be expecting to be able to get a full green line indicating?
Is there a way to initiate a ram render?
I have tried the proxy settings but they just scale down everything... I can't see the point of it.
I am moving our facility away from Adobe Prem & AE but our editors will kill me if I can't find a solution or work around. ....
Should we be using Fusion stand alone?

Cheers

I have found the Cache to disk command so that is now at least assisting but it still works a little clunky.
Still takes a few attempts before playing in RT.
I had found a blog in this forum "Understanding Caching" which was helpful but was a little disappointed that
it was first posted a year ago and it seems nothing has changed.

Fusion is more like After Effects in this respect, it's not really aiming at realtime performance, but at complex compositing. You'll need to cache.

Agree Uli,
I'm learning as fast as I can and love the resolve package.
Im trying to get up to speed too fast, the right click "Cache to disk" option on the nodes is not in the
"Fusion Ram cache for playback" section of the manual, in fact I have done a search in the manual
for "cache to disk" and still cannot find it.
Thanks