If the above code in /dokuwiki/conf/userscript.js
does not work, you can try this instead:
if( JSINFO['id'] == 'start' ) {
jQuery("#dokuwiki__content").css({ 'animation': 'delaypage 1.5s' });
}
You can finetune the delay by changing the animation parameter behind delaypage to 0.8 seconds like so:
jQuery("#dokuwiki__content").css({ 'animation': 'delaypage 0.8s' });
... or some more or less. Cheers!