Mass invoice prine issue

Hello,
We have recently mored to he new server and we are facing following issue.
Few times per week we need to print and save our several sale invoices (Sales > Orders > Print the invoice). When we check over x10 orders and pressing "Print the invoice" button in the top right corner we land on our invoices page, but, when we are trying to print or save the invoices to PDF from the print screen (Ctrl + P) the window on the left endlessly shows "Loading Preview..." and the website stops responding.
With the old server we ddin't had such problem. The invoices were loading fast and we couls simply save them to long PDF document.
Does anyone had a similar problem? Can you help us resolve it?

Thank you.

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What PHP version was on old server?
What PHP version is on the new server?

You have checked errors log?
Server error log?
Bowser console log error?

PHP version on both servers is 5.6
The problem apprears only when we are trying to print more than x10 invoices per one attempt. If less than x10 then the system works fine.