high CPU usage due to external media optimization call

I am using external featured images in featured image for woocommerce. I have enabled media optimization options like LQIP, webp version etc. After that my site pages loading slowly and High CPU usage seen in the server. I am using OpenLiteSpeed with Cyberpanel. Server’s error log showing errors like PHP Warning: getimagesize(//cdn.zivame.com…) failed to open stream etc. Site becomes ok when all the image optimisation options are disabled.
How to prevent external images being Optimized so that lightspeed will not call this images for optimisation?
Screenshot: https://ibb.co/hLG8dD4
Website: https://cbshop.in/v-neck-solid-color-t-shirt-from-zaful-fashion-9/