You can pre-compile your scripts as a text file.
However, in my tests this makes negligible difference.
The issue being described applies only to the Execute an AppleScript action (and to a degree, other Execute actions).
It does not apply to things like the Type a Keystroke action, so the last thing you want to do is convert them to AppleScript.
As with everything related to any form of optimisation - only optimise something that actively is causing you an issue. In the case described in this thread, presumably the 0.25s extra delay is an issue. In other cases (as part of a longer script for example), it would not be noticeable and indeed then, the script itself might then offer different opportunities for speeding it up - if the time taken was an issue.