Hi all.

For years I've been editing on an iMac from late 2012, but finally got too fed up with slowness.

This past week I installed a shiny new 2020 imac 3.6ghz 10 core with the best possible GPU (5700XT with 16gb).  I've been surprised to see that on a sequence with a simple HD AMA clip and a title on it, I'm still getting the dreaded yellow and red lines above the timeline causing playback stutter.  Someteimes even after rendering.

Surely this cannot be and there are some settings I can adjust.

Does anyone have some tricks up their sleeves to get rid of this annoying problem?

FYI I have it on the yellw/green quality view setting.

Thanks,

Brad

What are your media settings, and what type of drive does the media reside on?

Thanks for the response. The AMA clips are a mix of some stuff on my insternal SSD hard drive and some things on a USB-C Lacie Rugged 4TB drive connected via thunderbolt port. Clips are a mix of media.

For example includes the following:

Transcoded clips to DNxHD LB (HD 1080p)

AVC Long-GOP High HD 1080 AMA linked with UME

H.264 

But seriously, here's a screen shot of a section where there's hardly anything, a transcoded clip, some temp text from Avid titler+ ( hate it by the way), and some music.  Surely something's not right here...

The media's on a USB-c drive.  Blackmagic speed test clocks it at 120 MB/s write 131 read.

Generally using AMA linked HD of different codecs, (h.264, etc)

But strangely Titler+ seems to be causing problems.

For instance there's one patch where there's an AMA HD clip, a title, and some music, and it's struggling.  Surely can't be right.

Titler+ doesn't seem to playback anything in RT w/out rendering. 

Can you get access to a Thunderbolt 3 Raid to test if there's any lag? LaCie Rugged may not be robust enough.

Buzzkill:

Can you get access to a Thunderbolt 3 Raid to test if there's any lag? LaCie Rugged may not be robust enough.

Yes it's almost certain to be the hard drive. That's a single spinner speed. I've had many such drives during remote work from TV companies, all for UK broadcast just HD, usually only DNxHD 36 too and every one struggles. First thing I do is txfr them all to a series of relatively cheap MyBook Duo raids (great because you can disable polling and they are WD Reds). Even using the original drive with an Apple adaptor TB2>TB3, if it has it, is a vast improvement. The raids work fine with USB-C 3.1.