Lock screen and animated gif

[jbv at souslelogo.com]

Hi list,
I have a script that modifies line by line the color
and textstyle of some words in a field that can be up
to 500 lines long.
I am using "lock screen" to speed up things.
But at the same time I have a spinning animated gif
to tell end users to wait until the modification is
done.
The problem is that "lock screen" freezes everything
and the gif stops spinning.
Is there a workaround for using "lock screen" and an
animated gif simultaneously ?

Thank you in advance.
jbv