Hi everyone, I am curious what method of pulling data from a few posts to my landing page would be most efficient. I want to display a summary of a few events and news articles from other WordPress sites that I own. One would be on separate subdomain (different wp environment) and the other would be on the same domain but in a different sub site of my multi site environment. Would a JS API request be faster than doing it via a custom plugin in PHP? I don't care what technology I would need to learn to make this happen, I just don't want to introduce any new slowness to my site.
The page that is pulling the data is the main landing page for my organization so performance is important.
Any information/ perspective on the topic is appreciated, I am open minded to any tech/thoughts/ideas!

RSS?