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GIANT lag sppikes

PotatoPC_MC 4/21/26 4:58 pm history
244
5/2/2026 3:12 pm
help!
a lot of my minecraft maps are experiencing odd events where the fps drops to 0 for a split second, goes back to normal, then 1 second after it does the same thing - its a pattern
idk what to do

the big red lines
i dont understand
its on/off sometimes, and its happening with multiple worlds
is someone willing to help?
(my pc is old so 29 fps is normal for me)
Posted by
PotatoPC_MC
Level 2 : Apprentice Crafter
1

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13

AlmostASkuf
04/24/2026 5:12 am
Level 1 : New Miner
history
If you’re on an older PC, these kinds of lag spikes are often caused by low RAM or Java doing garbage collection pauses. You could try tweaking your JVM arguments or allocating a bit more RAM to Minecraft (just not all of it), since that can sometimes smooth out these stutters.

As an alternative to Minecraft, I can recommend quick games - something simple and easy to understand. You can find such games here. The site offers a wide variety of entertainment options, and everything works well. I recommend checking it out
6
PotatoPC_MC
04/24/2026 9:43 pm
He/Him • Level 2 : Apprentice Crafter
ill look into it
2
Papa Enny
04/24/2026 7:55 am
Level 62 : High Grandmaster Answer Dwarf
Use mods like sodium, reduce graphical settings and adjust the ffps to a certain limit(30) as unlimited might cause the jumps
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PotatoPC_MC
04/24/2026 9:43 pm
He/Him • Level 2 : Apprentice Crafter
thx, setting the max fps to 50 didn't remove them completely, but they definitely last a lot shorter, down to a playable amount

this helps
3
Papa Enny
04/25/2026 11:13 am
Level 62 : High Grandmaster Answer Dwarf
Great, but at least you have something. Also render distance might be an issue: my recommend is max 5
2
PotatoPC_MC
05/02/2026 3:12 pm
He/Him • Level 2 : Apprentice Crafter
ok i'll try that
2
ScotsMiser
04/21/2026 6:26 pm
Level 70 : Legendary Miner
Image 404s

That you're asking suggests this is a recent phenomena...
Have you changed anything in roughly the same time frame (particularly if you're now using a new mc version)?

You may also have an issue with freespace on your hard disk[​s] that could result in stutters whenever garbage collection or the like runs.
3
PotatoPC_MC
04/22/2026 6:57 pm
He/Him • Level 2 : Apprentice Crafter
thanks, ill see what i can do
i did get a new monitor, but that shouldn't affect it.
3
ScotsMiser
04/22/2026 7:43 pm
Level 70 : Legendary Miner
The only way I can see a new monitor being the issue is if it required new drivers....
2
PotatoPC_MC
04/24/2026 1:13 am
He/Him • Level 2 : Apprentice Crafter
nope, no new drivers
3
PotatoPC_MC
04/24/2026 9:35 pm
He/Him • Level 2 : Apprentice Crafter
thanks for your guys' help
ill see if i can fix it more
2
bonkmaykr
04/24/2026 7:54 pm
Level 15 : Journeyman Unicorn Dog
history
if this is the latest version you should be using multi-threaded chunk reloading because otherwise a chunk reload will block the main thread for however long that takes to complete. which can take a long time for you.

a block moves in your world or gets desynced, the game tries to update the mesh so collisions stay accurate and the gpu isn't rendering old data. that means it has to iterate through every block in the chunk to procedurally generate the mesh data... (i have not directly read the code but this is very likely what it is doing). CPUs are terrible at processing lots of small samples like that so if your computer is old enough that occasional hiccup will turn from a 1% framedrop to a 1000% one.

it might help if you were more specific about the hardware you have.
2
Bertoxx
04/21/2026 6:05 pm
He/Him • Level 39 : Artisan Engineer Herobrine
Yep its definitely your PC
2

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