WooThumbs: Product gallery images are loading slow - wordpress

I installed "WooThumbs - Awesome Product Imagery" plugin on my WooCommerce site to display the product gallery nicer. I found that the thumbnails generated by WooThumbs are loading slow or sometime I need to refresh the page to have them loaded.
I first thought it was the thumbnails/product image gallery size are too large. But it is about 150kb per image which I think is good ?
This is the link to a single product of my site. Can anyone give me some ideas to improve this ?
Below is the picture which shows it is in loading state:
Thanks a lot,
CK

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Re-process all Images in WordPress

I've got a blog that has the highest-resolution version of all its images embedded in the posts, rather than a thumbnail linking off to an image attachment page.
Can you tell me how I can re-process all embedded images so they're output as reduced size thumbnails that link off to their own attachment page (which is WordPress default settings)?
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