Try the following small script:

function main()
{
SOUND* s = snd_create("mysound.wav");
wait(1);
dtimer();
snd_play(s,100,0);
printf("Time: %.3f ms",dtimer()/1000.);
}

Use some sound files that you have, with sounds of several seconds. Let us know which times you get with version 8.10 and 8.03.