hi guys so i was wondering about the “press green flag twice to reduce lag” thing on scratch.
does it really work and if so how does it work?

thanks

Magic.
Blocks can sometimes not load properly, so you'd need to click it again

Do you have a project where this is the problem?

“click the green flag twice” is most often indicative of code that has not been given a clear order to run in. A script that resets a variable might run before that variable is used by another script, so clicking the flag again ensures that any use of that variable happens after it was already reset. Usually the scripts can be combined or triggered by broadcasts so that the order is clear and guaranteed.

Example of problematic code (don't do this):

This can be solved like this:

Alternatively with broadcasts:
(in larger projects this is a lot more useful. I prefer this method.)