Short-freeze (pause) when typing.

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One thing to check. Go to System Preferences>Universal Access>Keyboard and check to see that "Slow Keys" is turned off. Sometimes UA features get turned on by accident with odd effects.

Good luck!

Hi there,

Check also the Language & Text settings.

Make Spell Checker inactive and make some tests.

Good luck.

Hi M,

Check if the issue is not limited to text inputs. Open a sorted items folder in a Finder Window and quickly type some items first 3 characters, items should be selected, a small pause and repeat for other character sequence.

Good luck.

Hi M,

Fine! So we know this is not a hardware issue and that it seems to be isolated to text inputs. Let's test some more.

Choose Log Out from the Apple menu and on the login use for User Name: >console (with the ">" sign) and hit enter, you will drop the graphic interface and use only text interaction. You should be prompted for your login name and password at this time. From the prompt you can use some simple command line and text editors, while typing commands you will see if you have delays.
Here are some simple commands and shortcuts:

to check your location on the directory tree - pwd
to get a simple and long list of items at current directory - ls (simple) ls -l (long)
to change current directory - cd .. (to parent directory) cd Path/To/Directory (to subdirectory reference from the current) cd / (to root) cd /Path/To/Directory (using the root as starting point)
to print some command options available - help
to open some command manual - man comandname
to get help reading manuals hit the h key
to quit this help or manual reading hit the q key

Text editor:
Create a simple text file with the list of current directory contents - ls -l > listed.mycreatedfile (the ">" sends the output to the following file that can have any extension.
Open the file using nano text editor - nano listed.mycreatedfile
Type some more into file and use the CONTROL+X to exit, nano asks to save buffer, save it.

Exit console with the exit command line - exit

You should get to the Graphic Interface and feel relief 😉

Check if delay is present on this login screen also. I think it is related to spell checking.

Good luck.