PreventBlockFall
1.2.2Chunk falling block limiter/fix for falling blocks in cobweb/preventblockfall. 1.12.2-1.21+
Prevent Block Fall
This plugin limits the number of falling blocks per chunk. This way, lags disappear when for example anvils or sand falls into the web.
This big savings server RAM and CPU in 2-2.5 times! Lags on client side also not real. Server ticks are not far behind 
Permissions:
pbf.admin - reload plugin
Build:
mvn install; mvn compile
If you want to help the plugin - create a pull request! I am not against that
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