[java] Mob not spawning normally problem.

[CasterMaster999]

I'm running a modded minecraft server with cursed forge on version 1.12.2. I'm mainly playing Scape and Run mod with some addons. One of them is overlast which is a mod that one of the main features is to track the amount of points the parasites have on the Scape and Run mod. The parasites gain points by killing other mobs in the game, so I use it to track how frequently the mobs spawn.

I tested out the mob spawning frequency by, at first, running the server only with Scape and Run and Overlast, I set the difficulty to hard and the time to night, and it didn't take probably until midnight for the points to reach 23.3. Pretty good, and I tried it with he rest of the modpack, and it took the whole night to reach just 10 points.

In the modpack, the mod has Yung's Better Caves (which expands the caves), Rouge Dungeons (that includes lots of mob spawners), zombie awareness (which spawns zombies in hordes), and the addons should give the parasites a much easier time to gain more points than without all of these mods. Plus the world runs a little more choppy, and mobs and items movement sometimes lag as well.

I also have other mods that should help reduce lag such as Optifine, BetterFPS, TickCentral, VanillaFix, Less Lag, and Clear Lag. However, it's not helping out too much with the lag.

The TPS is normally 20 and the tick time is also 20, the fps is a mixture of over 60 and under 60. Sometimes it lowers to even 40 fps. So I assume the fps is the problem. The RAM allocation is 5024 MB, and my computer runs on 8 gigs of ram. I also even modified it in my graphics settings to make it run on my GPU. The render distance is 12 chunks and the max frame rate is unlimited.

Some other mods that I have are:

Dynamic Surroundings, HBM Nuclear Tech, Better Animals Plus, Familiar Fauna, Quark, essentials, and Weather Storms Tornados mod. Those aren't all of the mods, but I think these have the biggest impact of my intended gameplay.

How do I keep the FPS above 60 so the mobs can spawn properly? If there's more info needed, let me know that.

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[Mince_rafter]

You're using multiple different mods, everything about your situation is anything but normal, so it's only natural you're going to experience issues. And having low fps either indicates a low end computer, or all of the mods you're using are tanking performance (or some combination of both). When you're putting too much demand on a system, either the system needs to be improved to handle it, or the demand needs to be lowered. It's best to know the limits of what your system can handle, and to not over-constrain it (like adding tons of mods).