In a survey with 500 questions, I need to hide blocks dynamically and show only 50 questions.

Hello,
I have a survey with 500 comments and for each comments there are two fixed questions based on each comment. Each comment with a pair of two questions are in a new block. I am creating this via qualtrics API.
My requirement is to show 50 comment and its question (i.e. 50 blocks) out of these 500 questions blocks to each user. My server will send me a set of 50 index and I need to display accordingly.
I need to hide the block at the start of survey when I get the list of questions from my server. I was able to hide questions by using this code -
Qualtrics.SurveyEngine.addOnload(function() {
jQuery("#"+this.questionId).hide();
this.clickNextButton();
});
But if I use this, I will be skipping 450 questions while traversing through the questions. It will be a very bad experience for the user with considerable lag to load each questions.
Is there any way to hide the blocks/questions at the start of survey ?