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Enigmatica modpacks include the performance mods that we consider to be stable enough for most users.
These parameters improve the way Java handles memory (particularly garbage collection) and are tailored for Minecraft. Note that these arguments do not include the Xms and Xms settings, which are usually included by the launcher you are using, but not always. You may need to add those as well.
-XX:+UseG1GC -Dsun.rmi.dgc.server.gcInterval=2147483646 -XX:+UnlockExperimentalVMOptions -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
You may find that different JVM arguments work better or worse for you. This post was made quite some time ago and there may be better options available now.
Some users will see performance benefits from installing OptiFine. In general, we've found that OptiFine reduces CPU usage but increases RAM usage and modpack loading times - please be patient - it typically takes several minutes longer for the modpackpack to load if using OptiFine. It is normal to see a "Not Responding" popup during this time - please wait it out rather than closing the game.
Please see the Server Setup guide for Troubleshooting Lag. The same tips also apply to a single-player world. Both the built-in debug profiler provided by Mojang and the Spark mod can help you track down sources of lag in your world. Having a report generated by Spark will help substantially if you are seeking support on Discord as our support team will typically be able to identify the cause from it.
The most common cause of low TPS is mob AI, and the most common cause of that is caves full of zombies holding items. Zombies that have an item in their hand don't count towards the mob cap and don't despawn, so can often pile-up underground without a player noticing.
The next most common cause is a high number of chunks loaded. This can be caused by chunk loaders, a high number of players being online (if in multi-player), or a high render-distance.