Server crashes after starting

The server seems overloaded and I'm just wondering what I should remove to make it run better?

LOG:

[23:00:01] [Server thread/INFO]: Starting minecraft server version 1.7.10

[23:01:00] [Server thread/INFO]: Loading properties

[23:01:00] [Server thread/INFO]: Default game type: SURVIVAL

[23:01:00] [Server thread/INFO]: Generating keypair

[23:01:01] [Server thread/INFO]: Starting Minecraft server on *:42453

[23:01:09] [Server thread/INFO]: Preparing level "world"

[23:01:56] [Server thread/WARN]: Unable to find spawn biome

[23:03:20] [Server thread/WARN]: Unable to find spawn biome

[23:03:31] [Server thread/INFO]: Preparing start region for level 0

[23:03:32] [Server thread/INFO]: Preparing spawn area: 2%

[23:03:33] [Server thread/INFO]: Preparing spawn area: 5%

[23:03:34] [Server thread/INFO]: Preparing spawn area: 7%

[23:03:35] [Server thread/INFO]: Preparing spawn area: 9%

[23:03:36] [Server thread/INFO]: Preparing spawn area: 12%

[23:03:37] [Server thread/INFO]: Preparing spawn area: 15%

[23:03:38] [Server thread/INFO]: Preparing spawn area: 18%

[23:03:39] [Server thread/INFO]: Preparing spawn area: 22%

[23:03:41] [Server thread/INFO]: Preparing spawn area: 27%

[23:03:42] [Server thread/INFO]: Preparing spawn area: 31%

[23:03:43] [Server thread/INFO]: Preparing spawn area: 36%

[23:03:44] [Server thread/INFO]: Preparing spawn area: 41%

[23:03:45] [Server thread/INFO]: Preparing spawn area: 46%

[23:03:46] [Server thread/INFO]: Preparing spawn area: 49%

[23:03:47] [Server thread/INFO]: Preparing spawn area: 51%

[23:03:48] [Server thread/INFO]: Preparing spawn area: 55%

[23:03:49] [Server thread/INFO]: Preparing spawn area: 59%

[23:03:50] [Server thread/INFO]: Preparing spawn area: 64%

[23:03:52] [Server thread/INFO]: Preparing spawn area: 66%

[23:03:53] [Server thread/INFO]: Preparing spawn area: 70%

[23:03:54] [Server thread/INFO]: Preparing spawn area: 75%

[23:03:55] [Server thread/INFO]: Preparing spawn area: 76%

[23:03:56] [Server thread/INFO]: Preparing spawn area: 80%

[23:03:57] [Server thread/INFO]: Preparing spawn area: 83%

[23:05:02] [Server thread/INFO]: Preparing spawn area: 84%

[23:05:03] [Server thread/INFO]: Preparing spawn area: 86%

[23:05:04] [Server thread/INFO]: Preparing spawn area: 90%

[23:05:05] [Server thread/INFO]: Preparing spawn area: 93%

[23:05:06] [Server thread/INFO]: Preparing spawn area: 97%

[23:05:07] [Server thread/INFO]: Done (237.143s)! For help, type "help" or "?"

[23:05:07] [Server thread/INFO]: Starting GS4 status listener

[23:05:07] [Query Listener #1/INFO]: Query running on 0.0.0.0:42453

[23:06:35] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 3872ms behind, skipping 77 tick(s)

[23:06:46] [User Authenticator #1/INFO]: UUID of player LostDuckie is 82bdc287-31a8-4fac-b213-af684985df40

My Aternos account is LostDuckie

The server runs fine for a little moment and I can play for like a few minutes but, then it just gives up on life like me.

Software: 1.7.10 Forge

Mods:

ArchimedesShips

BiblioCraft

BiomesOPlenty

CarpenterBlocks

CustomMobSpawner

Decocraft

DrZharksMoCreatures

FoxLib

InventoryTweaks

MCA

MorePlayerModels

MrCrayfishFurnitureMod

PamHarvestCraft

RadixCore

Tails

Vampirism

aether

coroutil

fairylights

gildedgamesutil

twilightforest

I used to have more mods on the server but, I removed some in hopes of fixing the problem and the server seems to be running better.

Still seems to run into some problems though just not as often.

Mods Removed:

Witchery

Traincraft

Worldedit

Thaumcraft

Treecapitor

Welp, guess time to play the guessing game.

Thanks SmasherYT, I'll try that out.