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Extreme TPS lag on singleplayer | Testing modpack

Ethonodon 6/13/26 2:20 am history
24
6/13/2026 5:58 am
I have a 1.18.2 modded forge server I'm planning to migrate to 1.20.1, and I'm testing out the 1.20.1 version of its modpack in singleplayer. The problem is, in singleplayer, I am getting an unplayable amount of TPS lag. Roughly every 30 seconds the entire "server" will completely freeze for about 10-20 seconds.

Now, I know that this modpack SHOULD work, as it's almost the same as the 1.18.2 version I've had working smoothly on a server for 1.5 years now. I did add a few new mods for 1.20.1, which I'll list below, but I'm not sure if any of those could be problematic. I'll attach some spark profiles below, as well as my modlist. The forge version I've been using is 47.4.10.

If anyone could provide some insight as to what might be causing this issue, it would be much appreciated!

https://spark.lucko.me/bPePAro6O6

https://spark.lucko.me/f7f8aLPvFQ

modlist

modlist

new mods

new mods
Posted by
Ethonodon
Level 1 : New Miner
1

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Craftplayer23
06/13/2026 2:31 am
He/Him • Level 36 : Artisan Explorer Builder
I guess there are just too many mods. Try to use only the ones you really need. Maybe you don't need some of the big mods like Create?
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Ethonodon
06/13/2026 2:41 am
Level 1 : New Miner
nah, definitely not too many mods. I've ran far more than this before without issue. And again, have ran a server with a very similar modpack for 1.5 years without issue
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Craftplayer23
06/13/2026 5:58 am
He/Him • Level 36 : Artisan Explorer Builder
Okay sorry, I'm not a mods expert.
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