Update mixin properties in modernfix-mixins.properties to override defaults for mod compatibility, specifically for chunk deadlock, paper chunk patches, strongholds caching, and protochunks.

Server/config/servercore/optimizations.yml

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+# Allows you to toggle specific optimizations that don't have full vanilla parity.
+# These settings will only take effect after server restarts.
+
+# Prevents many different lagspikes caused by loading chunks synchronously.
+# This for example causes maps to only update loaded chunks, which depending on the viewdistance can be a smaller radius than vanilla.
+reduce-sync-loads: true
+# Can significantly reduce the time spent on chunk iteration by only updating the ticking chunks list each second, rather than each tick.
+# This is especially useful for servers with a high playercount and / or viewdistance.
+# Note: This setting is incompatible with Moonrise.
+cache-ticking-chunks: true
+# Optimizes command block executions by caching parsed commands.
+# Command parsing is a relatively expensive operation. By caching it we avoid parsing the same command every time it is executed.
+optimize-command-blocks: false
+# Can significantly reduce time spent on mobspawning, but isn't as accurate as vanilla on biome borders.
+# This may cause mobs from another biome to spawn a few blocks across a biome border (this does not affect structure spawning!).
+fast-biome-lookups: false
+# Fluid random ticks, like lava spreading fire, are run twice each game tick.
+# Enabling this will cancel the 'duplicate' second fluid tick, but this may cause slight behavior changes.
+cancel-duplicate-fluid-ticks: false