crackles issues on mac book with preview & pianoteq issue resolved

For those who have experience issues with mac OS & pianoteq with clackles occurring when scrolling scores on preview while playing, I have managed to get rid the issue. After playing with all parameters, nothing really worked. The fix is to open pdf scores with Safari browser instead of Preview and it works like a charm, so you really the beautiful presets of PTQ 8. It is a Mac OS related issue , not a Pianoteq one as after investigation in the apple support groups, there are many users reporting CPU %usage burst with the Preview application which don't cause problem in normal usage but cause crackles in real time playing .