The View Distance Tweaks plugin dynamically changes the view distance (or, "render distance", when using a client) for all of the players depending on the TPS amount.
Example:
TPS is 14. View distance set to 7.
TPS is 20. View distance set to 10.
TPS is 5. View distance set to 3.
The source code is available for all to see. It is also lightweight - basically, it improves performance.
The plugin works from versions ranging from 1.14 to 1.16.
The ratings indicate that the plugin is high quality. I tested it on my localhost test server, and it worked flawlessly with Spigot and Paper.
SpigotMC: https://www.spigotmc.org/resou…e-tweaks-1-14-1-16.75164/
Source code: https://github.com/froobynooby/ViewDistanceTweaks
I wish this plugin will be added, because it improves the TPS a ton and I'm really happy to see a plugin like this come out. 
