Apps launch slowly from app bar after Golden Gate update

Restart the Dock process using Terminal. The killall Dock command is a Terminal instruction used on macOS to force quit and instantly restart the Dock process. It is completely safe to run and does not delete your files or data. 

How to Run It

• Open the Terminal app (Spotlight search or Applications > Utilities).
• Copy and paste the following command exactly as shown (the capital "D" is required):

killall Dock

• Press return. Your screen will briefly flash, and the Dock will reappear refreshed

If that does not work, then have you rebooted your Mac? If not, do so. If that does not help, then see if the problem is present when you boot in safe mode. That process performs some system cleanup and clears caches, and also disables 3rd party extensions that may cause problems.

Start up your Mac in safe mode - Apple Support

If that does not correct the issue, test in a new user account. A newly-created user account will have all settings at default, and if the issue does not occur in that new account then it provides guidance on what may need to be changed to correct the issue.

Add a user or group on Mac - Apple Support

Once the testing is complete, the new account can easily be deleted.

Delete a user or group on Mac – Apple Support

Those steps will help to isolate the problem.

The fact that apps launch faster through Spotlight (⌘ Space) than from the Dock is a useful observation.

It indicates that the apps can launch more quickly when started through Spotlight. Apple confirms that the Dock and Spotlight provide separate ways to open apps. (Apple Support)

First, restart the Mac and check System Settings → General → Software Update to make sure macOS 27 is fully up to date.

Apple recommends macOS 27 updates for stability, performance, and compatibility. (Apple Support)

Then test the same app from the Dock, Spotlight, and Finder >> Applications.

Note whether the delay occurs only from the Dock or also from Finder, and whether it affects all apps or only particular apps.

If an affected app is shown as running in the background, you can Control-click its Dock icon and choose Stop Running in Background as a test.

Apple notes that background activity might affect Mac performance.

You can also review System Settings → General → Login Items & Extensions → Background App Activity. (Apple Support)

If the delay occurs, open Activity Monitor and check the CPU and Memory tabs while the problem is occurring. This can show whether a process is using unusually high CPU or memory at the time of the delay. (Apple Support)

I would not rebuild the Spotlight index at this stage because Spotlight is already launching the apps quickly.

If the problem continues, note approximately how long the Dock delay lasts and whether it occurs with all Dock apps or only specific apps. Those observations, together with what Activity Monitor shows during the delay, will help determine the appropriate next step.

Does the current is directly relate to this other issue ?

And if so, how ?

Mac is running slow - Apple Community

What do you mean by "app bar?" Do you mean the Dock?

Thank you, as your suggestion worked, and it is now opening at the same speed as spotlight