realtime playback issues in R15

I've recently installed R15 and I'm having some issues with playback.

Playback stutters usually at the cut point to a new clip. I do notice that after I play back a sequence once and then replay it, playback gets much better. I have caching turned off.

I'm working on ProRes 4444 camera original in 2048x858 format. Files are stored on a RAID 0 that should be way more than fast enough.

I can render the the sequence at more than 2x realtime.

If anyone has an idea of some Resolve setting to improve this situation, your suggestions would be most welcome.

I am running a Windows HPz820 with lots of RAM and a TitanX (GPU). I do have a lot of nodes in my corrections, but many of them are empty at this point. No noise reductions, but I do have a glow OFX filter included.

It kind of feels like some thumbnail is being updated upon every new clip that might cause the delay. Turning off the clip thumbnail display in the color page doesn't help though. They might be still updating, even though they are not being displayed.

Thanks!

This issue seems to be related to drawing new timeline thumbnails. Once the timeline is played once, all is fine. But the new thumbnails are not saved, so that re-opening the project begins the problem again.

Is there some setting about where the thumbnails are stored? (not the gallery thumbnails)

Are they stored in the database? Is it a problem that the database is on the same SSD as the Resolve app and the OS?

Any ideas?

Thanks.

Disabling thumbnails and waveform display may help

Disabling thumbnails and waveform display may help

Thanks Tony. I tried that and it didn't help.

FWIW, I find realtime playback a real hit or miss thing, sometimes even with caching turned on and/or using optimized media, I still get jerky timeline playback even when it's showing 29.97 above the playback window. At this point I don't know if it's an issue with my PC, how windows 10 is configured, Resolve itself or a combo of any of the above.

Last week I was compiling a video with all 1080p clips and was still getting the issue, today I have a couple of dozen UHD clips in the timeline and the're playing perfectly smooth, with render caching turned off.

My OS is on an M2 960 EVO SSD, and I use two SATA SSD's to (final) render to and cache to.

I find that if I do a complete shutdown and start of windows, (not a restart) and open up Resolve (15.1.2) with my project, it works great, even with Chrome open with a dozen tabs, SqlDeveloper on another monitor, Paint Shop Pro etc. - I still get good playback, even with UHD files. However when I open Resolve up after opening a few other things, I usually have issues. It seems if it is the first program opened it grabs the resources it needs and hangs on to them.

One day I'll spend more time researching on how to allocate exclusive resources to Resolve, I'm tempted to set up dual boot with a linux distro and see if it'd better running on Linux..