The server is crashing often - on the order of minutes.  It also is taking a very long time to execute some operations like eating, smelting, and brewing.

This is happening in a chunk that has a great deal of redstone and a great many villagers and animals.  The server seems stable away from this chunk.

This world was stable with very little lag in 1.14.4.  I have uploaded the world in its current state as well as its last state in 1.14.4.  Link provided below.  I have also uploaded a screenshot of the server system specs to the same location.

I am currently running the client from the same machine as the server.

Additional notes that may be useful:

• Animals and villagers move in short steps with pauses instead of smoothly.
• Golems in lava take a very long time to die, with each sound occurring with a long pause in between.
• I reached an impasse trying to brew a potion.  The server crashes before the slow operation can complete.  Then, when the server restores, the blaze rod is used but the potion brewing starts over.
• CPU utilization seems fine.  Uploaded screenshot.

Link to worlds and specs:

https://drive.google.com/drive/folders/1eReWDHUW6xnNoHbHDpOvRfxoYEjmPQHM?usp=sharing