Photoshop is so laggy on my MacBook Pro 2019.

This kind of lag in Photoshop on a 2019 MacBook Pro is often caused by settings, cache buildup, or newer macOS/Photoshop versions being heavier than older setups. Checking GPU settings, scratch disk space, and cache cleanup usually helps restore smoother performance.

Do you have a laptop cooling pad?

https://www.amazon.com/laptop-cooling-pad/s?k=laptop+cooling+pad

There have been some user reports that having the Display scaling set to something other than Default can cause Photoshop to lag on Intel systems.

Apple>System Settings>Display

Hi!

One of the things I have noticed on my machine—I also have the 2019 16” MacBook Pro—is that when it gets hot, it slows down to a crawl. What I have done as a work around is to keep an external fan blowing on the machine to cool it down. That is one thing that seems to be helping. The other is to close any programs or browsers running music or video, which also will speed up your machine. Having a video going while you are in Photoshop can heat up the machine and use ram and will slow it down.

If this helps, you may want to take your machine in to Apple and have them check your internal cooling fan to see if that is the main issue.

Michelle

As a data point, I am running Photoshop 27.4 on a 2019 16” MacBook Pro w/16GB of RAM, 4GB AMD Radeon Pro 5300M and Tahoe 26.4 without major issues. By far the slowest operation is Adobe Camera Raw running in Bridge. Photoshop runs fine without much lag or stalling. 

 ​@ahadrani 

Is your 2019 MB Pro Intel (probably) or Silicon?

Technical requirements for version 27.x and later

Windows macOS

Details for system requirements are here:

https://helpx.adobe.com/photoshop/desktop/get-started/technical-requirements-installation/adobe-photoshop-on-desktop-technical-requirements.html

It defaults to Windows, so click the tab for macOS

Jane

Is your hard drive short of free space?
How much RAM? VRAM?
Have you examined Adobe processes using Activity Monitor?