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ddublu

macrumors 65816
Original poster
Jun 26, 2011
1,369
73
I came from a 2015 iMac and my main workhorse apps are Lightroom, Photoshop, and Final Cut Pro. I had a general family iMac finally bite the dust so I replaced it with my workhorse from 2015 and picked up a new iMac for myself.

2015 build:
4ghz quad core I7
32gb RAM - 1867 MHz DDR3
Radeon R9 M395X 4gb

2020 build:
27" 3.8GHz 8-core I7
64mg RAM - 2667 MHz DDR4
Radeon Pro 5500 XT 8gb

Seems quite a bit faster when opening apps and maybe just slightly faster in the apps but there are still times that it seems to hang up. I am running Big Sur public beta so suppose that could have something to do with it but other than that, anything I should double-check?
 
You've provided only part of the picture - what are you doing when "it seems to hang up?" Are you running data-intensive or processor-intensive processes when that happens? Is all your data located on the internal HD (which, being a 2020, would be all-Flash SSD), or are you also accessing from external HDDs, cloud storage, etc?

Activity Monitor can help you analyze where the bottlenecks may be. If you're not familiar with its use, for a start read the Help document for that app.
 
Most likely the beta OS but tbf I haven't seen too many complaints about that yet.
 
I came from a 2015 iMac and my main workhorse apps are Lightroom, Photoshop, and Final Cut Pro. I had a general family iMac finally bite the dust so I replaced it with my workhorse from 2015 and picked up a new iMac for myself.

2015 build:
4ghz quad core I7
32gb RAM - 1867 MHz DDR3
Radeon R9 M395X 4gb

2020 build:
27" 3.8GHz 8-core I7
64mg RAM - 2667 MHz DDR4
Radeon Pro 5500 XT 8gb

Seems quite a bit faster when opening apps and maybe just slightly faster in the apps but there are still times that it seems to hang up. I am running Big Sur public beta so suppose that could have something to do with it but other than that, anything I should double-check?
Photoshop is blisteringly fast on my 2020 iMac processing 46 MP photos. If your RAM isn't installed right your memory may be running at half duplex.
 
You've provided only part of the picture - what are you doing when "it seems to hang up?" Are you running data-intensive or processor-intensive processes when that happens? Is all your data located on the internal HD (which, being a 2020, would be all-Flash SSD), or are you also accessing from external HDDs, cloud storage, etc?

Activity Monitor can help you analyze where the bottlenecks may be. If you're not familiar with its use, for a start read the Help document for that app.

One particular slow down was zooming in on an image in Photoshop to do some healing. I took a second or so to go 4-5 levels deep with the zoom. I have to think the beta OS has something to do with it. I checked activity monitor and nothing really jumps out there. The apps that I am using are at the top of CPU usage and everything else looks to be minimal in the background. My Lightroom catalog and Final Cut cache sit on my 1tb SSD in my iMac but all of my footage/imagery sit on a 16tb disk array connected via Thunderbolt 2.
 
I came from a 2015 iMac and my main workhorse apps are Lightroom, Photoshop, and Final Cut Pro. I had a general family iMac finally bite the dust so I replaced it with my workhorse from 2015 and picked up a new iMac for myself.

2015 build:
4ghz quad core I7
32gb RAM - 1867 MHz DDR3
Radeon R9 M395X 4gb

2020 build:
27" 3.8GHz 8-core I7
64mg RAM - 2667 MHz DDR4
Radeon Pro 5500 XT 8gb

Seems quite a bit faster when opening apps and maybe just slightly faster in the apps but there are still times that it seems to hang up. I am running Big Sur public beta so suppose that could have something to do with it but other than that, anything I should double-check?

Is it your 64 meg of ram ;)
 
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