Swifty bar will adds sticky bar at the bottom of post that shows category, post title, author, time needed to read article, share buttons together with share count, and previous/next post links. This plugin can easily replace your social share buttons while giving readers better experience with much more options. Its fast, coded with best practice, super light and will not slow down your site.
Check out demo here
We introduced share count in latest version of swifty bar. We are saving share counts inside WP Transients to keep things fast and fetching new shares once user clicks on any of the share icons, if no clicks have been made, share will refresh once daily, that way site is doing minimal requests to the share APIs which boosts its speed by ALOT.