My site was functioning perfectly until I installed this plugin, and immediately used it for a single post. I came back several hours later to find literally hundreds of High-Memory Use notifications in my email box.
I'm set up to receive these notifications when the site experiences problems.
The email read:
WordPress memory usage exceeded 64 MB
WordPress peak memory usage: 69.3 MB
Number of database queries: 3406
I raised the WP_MEMORY_LIMIT to 128 MB, but the email notifications kept coming non-stop. I deactivated the plug-in and they stopped.
Too bad, because it seems like a cool plug-in. I liked how it made my post look w/ Tweet image, but not worth the bad performance.