So basically you think the cost of generating a thumbnail of a website (likely less than 1/100 of a cent) is too expensive, so you make the client do it and des

So basically you think the cost of generating a thumbnail of a website (likely less than 1/100 of a cent) is too expensive, so you make the client do it and destroy usability in the process by making the page slow to a crawl. Remember, usability has a value, since you wouldn't make the website in the first place if people couldn't use it.