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I have an ecommerce website and have a product slider with 3 images.

Currently, I serve them at the native size when viewed on a desktop browser (374x374).

I would like to serve them using retina image quality (748px).

However how will this affect my ranking due to load time?

Does Google take into account image load times even though these are done asynchronously? Also as its a slider, its only the first image which needs to load. Do the other images contribute at all to the page load time?

I know someone that bought likes for their facebook page for an ecommerce site. What I can tell you is that they really regretted the decision.

1. The effect on conversion rate is absolutely tiny.
2. It ruins any metrics when you start doing social marketing. You won't be able tell which posts are engaging your customers etc.
3. You won't be able to remove the likes from your facebook page easily so think carefully before you buy a large number of likes whether its really worth it. IMO, it's not.

Actually why don't you run a conversion test and see what the effect is?

Setup a new facebook page. Buy yourself a bunch of likes.

Split test the pages with and without the fake facebook page.