Minecraft 1.17 Unplayable Lag when upgrading existing 1.16.5 worlds to 1.17

If you update a 1.16.5 world to a 1.17 snapshot (for example 21w14a), do you still experience this issue? If not, then update to that snapshot and then update to the release of 1.17 and see what happens.

If you update a 1.16.5 world to a 1.17 snapshot (for example 21w14a), do you still experience this issue? If not, then update to that snapshot and then update to the release of 1.17 and see what happens.

@SomeonePLaysMC Ok, so I did what you said. I upgraded my 1.16.5 world to snapshot 21w20a(because loading of old worlds was disabled in 21w14a). And, my game was running perfectly in 21w20a! However, when I further upgraded it from 21w20a to release 1.17, the game was stuttering, but this time it was running a little bit better than last time when I directly upgraded my world from 1.16.5 to 1.17. However, the lag is still unbearable in release 1.17, albeit a little bit less.

@SomeonePLaysMC Ok, so I did what you said. I upgraded my 1.16.5 world to snapshot 21w20a(because loading of old worlds was disabled in 21w14a). And, my game was running perfectly in 21w20a! However, when I further upgraded it from 21w20a to release 1.17, the game was stuttering, but this time it was running a little bit better than last time when I directly upgraded my world from 1.16.5 to 1.17. However, the lag is still unbearable in release 1.17, albeit a little bit less.

Try to update it to 21w20a, then to 1.17 pre1, then to 1.17 pre2, then to 1.17 pre3, then to 1.17 pre4, then to 1.17 pre5, then to 1.17 rc1, then to 1.17 rc2, then to release 1.17.

In what snapshot/version does the lag start?

Try to update it to 21w20a, then to 1.17 pre1, then to 1.17 pre2, then to 1.17 pre3, then to 1.17 pre4, then to 1.17 pre5, then to 1.17 rc1, then to 1.17 rc2, then to release 1.17.

In what snapshot/version does the lag start?

@SomeonePLaysMC Ok, so I did exactly what you said. My world was running smoothly till Pre-Release 2. After that, it gets interesting. I will break it down version by version after Pre Release 2:-

Pre-Release 3: Little laggy, not as bad as 1.17 but still a bit unplayable.

Pre-Release 4: Still laggy, but less lag than Pre Release 3, fairly playable.

Pre-Release 5: Unbearable lag, just like 1.17.

Release Candidate 1: Unbearable lag, just like 1.17.

Release Candidate 2: This one performed a little bit better.

1.17: Unbearable lag again.

@SomeonePLaysMC Ok, so I did exactly what you said. My world was running smoothly till Pre-Release 2. After that, it gets interesting. I will break it down version by version after Pre Release 2:-

Pre-Release 3: Little laggy, not as bad as 1.17 but still a bit unplayable.

Pre-Release 4: Still laggy, but less lag than Pre Release 3, fairly playable.

Pre-Release 5: Unbearable lag, just like 1.17.

Release Candidate 1: Unbearable lag, just like 1.17.

Release Candidate 2: This one performed a little bit better.

1.17: Unbearable lag again.

Go onto your world in 1.17 that you have lag on, then force a crash by holding F3+C for more than 10 seconds (if you are on a laptop, it's possibly FN+F3+C), then attach the crash report found in ."minecraft/crash-reports/crash-<DATE>-client.txt" to this issue. This will give us a lot of information about what is exactly happening.

More information about how to find a crash report: https://minecrafthopper.net/help/finding-minecraft-data-folder/

Go onto your world in 1.17 that you have lag on, then force a crash by holding F3+C for more than 10 seconds (if you are on a laptop, it's possibly FN+F3+C), then attach the crash report found in ."minecraft/crash-reports/crash-<DATE>-client.txt" to this issue. This will give us a lot of information about what is exactly happening.

More information about how to find a crash report: https://minecrafthopper.net/help/finding-minecraft-data-folder/

Here you go:-

Here you go:-

At the bottom of the crash report, it says that you have more incompatible data packs. The issue is most likely caused by these data packs that are incompatible with 1.17. Try to disable them and see what happens.

At the bottom of the crash report, it says that you have more incompatible data packs. The issue is most likely caused by these data packs that are incompatible with 1.17. Try to disable them and see what happens.

I deleted all the datapacks from my world's datapacks folder and opened the world in 1.17. Still lagging like before.

I deleted all the datapacks from my world's datapacks folder and opened the world in 1.17. Still lagging like before.

I am having a similar problem with my completely new 1.17 world. I run a multiplayer server. Normally there's an average of 3 of us on. When going through nether/end portals and loading new chucks sometimes the world caps out the RAM (2Gb) and freezes. When I installed a clear lag datapack (kills extra mobs and such on a cycle) it ran better but wasn't perfect. This update seems to generate a much higher amount of lag than previous versions. 1.16.x all ran smoothly on 2Gb in the past.

Edit: This isn't a client side issue -  MC-219639 does not describe my issue

I am having a similar problem with my completely new 1.17 world. I run a multiplayer server. Normally there's an average of 3 of us on. When going through nether/end portals and loading new chucks sometimes the world caps out the RAM (2Gb) and freezes. When I installed a clear lag datapack (kills extra mobs and such on a cycle) it ran better but wasn't perfect. This update seems to generate a much higher amount of lag than previous versions. 1.16.x all ran smoothly on 2Gb in the past.

Edit: This isn't a client side issue -  MC-219639 does not describe my issue

So, someone made a comment asking me if MC-219639 relates to my issue, and then promptly deleted their comment. It seems like yes, it does relate to my issue. Here's the link to MC-219639:-

MC-219639 Performance loss after using OpenGL 3.2 core profile - Jira (mojang.com)

Edit: It looks like MC-219639 might not relate to my issue, as per ampolive.

So, someone made a comment asking me if MC-219639 relates to my issue, and then promptly deleted their comment. It seems like yes, it does relate to my issue. Here's the link to MC-219639:-

MC-219639 Performance loss after using OpenGL 3.2 core profile - Jira (mojang.com)

Edit: It looks like MC-219639 might not relate to my issue, as per ampolive.

That was me. I thought it wouldn't be related because that refers to newly created worlds, while this issue is about old worlds loaded in 1.17.

That was me. I thought it wouldn't be related because that refers to newly created worlds, while this issue is about old worlds loaded in 1.17.

So do you have OpenGL 3.2?

So do you have OpenGL 3.2?

And can you go into your ".minecraft/saves" folder, find the folder with your world name, make it a zip archive, and then attach it to this issue? I want to open it in my Minecraft 1.17 to see if i have any lag on it.

And can you go into your ".minecraft/saves" folder, find the folder with your world name, make it a zip archive, and then attach it to this issue? I want to open it in my Minecraft 1.17 to see if i have any lag on it.

check your entity count because that just happened to my 1.16.5 main and it was because something forced my entity count all the way up to over 40,000

check your entity count because that just happened to my 1.16.5 main and it was because something forced my entity count all the way up to over 40,000

And another thing: does MC-228302 describe your issue? I tested it in 1.16.5 and it doesn't work, then i tested it in 1.17 and it DOES work and it generates a lot of lag and i get only 5 fps.

And another thing: does MC-228302 describe your issue? I tested it in 1.16.5 and it doesn't work, then i tested it in 1.17 and it DOES work and it generates a lot of lag and i get only 5 fps.

MC-228302 doesn't seem to directly describe my issue, because I didn't break any shut trapdoors, that might result in lag(if I understand this correctly). Anyways, here's the original zip file of my 1.16.5 world(before it was upgraded to 1.17):-

Edit: It doesn't let me upload my world, because the maximum size limit is 10 mb.

MC-228302 doesn't seem to directly describe my issue, because I didn't break any shut trapdoors, that might result in lag(if I understand this correctly). Anyways, here's the original zip file of my 1.16.5 world(before it was upgraded to 1.17):-

Edit: It doesn't let me upload my world, because the maximum size limit is 10 mb.

Can you upload the world to google drive and then give us the link?

Can you upload the world to google drive and then give us the link?

Ok, here you go(this was the original world last saved in 1.16.5, before upgrading to 1.17):-

https://drive.google.com/file/d/1HRGCQNroc4BZTtDRbKYBBUW5TYhfElqm/view?usp=sharing

Ok, here you go(this was the original world last saved in 1.16.5, before upgrading to 1.17):-

https://drive.google.com/file/d/1HRGCQNroc4BZTtDRbKYBBUW5TYhfElqm/view?usp=sharing

Ok, thanks for the world! I'll maybe check it tonight (at 20:00 in GMT+1) because now i have a lot of work to do for school.

Ok, thanks for the world! I'll maybe check it tonight (at 20:00 in GMT+1) because now i have a lot of work to do for school.

Ok so i managed to check the world now and what i can say is that there is definitely something up with the world.

When i loaded the world in 1.16.5, i got 25 fps which is kinda low but still playable.

When i loaded the world in 1.17, i got maximum 8 fps, and when i walk the fps cuts in half (i get 4 fps).

I will do more research of this issue and i'll tell you what is actually going on and what you can do to fix it.

Ok so i managed to check the world now and what i can say is that there is definitely something up with the world.

When i loaded the world in 1.16.5, i got 25 fps which is kinda low but still playable.

When i loaded the world in 1.17, i got maximum 8 fps, and when i walk the fps cuts in half (i get 4 fps).

I will do more research of this issue and i'll tell you what is actually going on and what you can do to fix it.

Thank you for your report!
However, this issue is Invalid.

Your computer does not meet the minimum system requirements to run Minecraft.

Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki

Thank you for your report!
However, this issue is Invalid.

Your computer does not meet the minimum system requirements to run Minecraft.

Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki

I'm sorry I have to come with this but we can't provide support for your hardware here :/

I'm sorry I have to come with this but we can't provide support for your hardware here :/

@violine1101 The minimum requirements for Minecraft stated in the website is Intel core i3 3210 @ 3.2 GHz, 4 GB RAM and Intel HD 4000 graphics. My PC does meet the minimum requirements!