[MC-250246] Moving in mangrove swamps FPS/TPS drop below normal forests

Moving in mangrove swamps FPS/TPS drop behind normal forests.
Could be worse when it rains.

Performance has improved significantly in the 23w16a, but is still lower than the normal forest.

Two related issues(MC-170134 & MC-279350) have been resolved in the 1.21.5 Pre-release 1, but the issue still exists.
The following are the settings:
1.21.5 Pre-release 2
Y=100
Mangrove swamps
49 ~ 126 fps
TPS 81 ms max

Normal forests
137 ~ 202 fps
TPS 41 ms max

Steps to reproduce:

Create a Single Biome world with Mangrove Swamp.
Use ALT + F3 to view FPS and TPS.
Move, run or fly in the world.

Environment

OS: Windows 11 Pro 24H2 OS Build: 26100.3194 CPU: Intel(R) Core(TM) i9-9900K GPU: NVIDIA GeForce RTX 3080 GL Version: 3.2.0 NVIDIA 566.14 RAM: 64 GB Java Version: 23.0.2

Linked issues

is duplicated by 1

MC-300651 Huge decrease in fps when looking at a mangrove swamp Resolved

relates to 18

MC-148095 Extreme FPS drop when moving in the biomes with lots of leaves Reopened

MC-155959 FPS drop when surpassing chunk boundaries while looking at leaves (with a low render distance) Reopened

MC-125007 World fails to generate decorations on seemingly random quarter chunks Reopened

MC-262689 Hanging mangrove propagule models are comically unoptimized Reopened

MC-170134 Minecraft uses several times more VRAM than needed after exploring terrain for a while Resolved

13 more links

Attachments

Comments 17

ampolive 2022-04-16T13:16:19Z

I believe that MC-218623 significantly contributes to this issue.

Avoma 2022-04-16T13:17:39Z

As stated above, a cause of this is likely MC-218623. Due to some vines being supported by leaves, when the leaves despawn, the vines are destroyed as well causing a slight performance drop when multiple instances of this occur within a reasonable amount of time.

[Mod]Les3awe 2022-04-16T13:20:01Z

MC-227319 too, I believe both issues are related to lag in jungle and mangrove swamp.

[Mod]Les3awe 2022-04-16T13:22:32Z

May be more serious for players reaching the game's minimum recommended performance.

syarumi 2022-04-18T21:54:41Z

Frame rate lag also seems to be more drastic compared to jungles/bamboo jungles due to the amount of roots (which are even laggier than leaves). And doesn't help that because of MC-249271 setting graphics to fast doesn't do much for weaker machines.

7 more comments

pulpetti 2022-05-03T11:48:09Z

In 22w17a.

migrated 2022-06-25T18:29:54Z

Navigating a mangrove swamp when the weather is set to rain is especially awful, and frankly unplayable. I attached a screenshot; note that I'm running a high end system with 64GB RAM and a 16GB heap size on both my server and client. My RTX 2070 Max-Q GPU is capping out as well. I'm even running Sodium.

migrated 2022-08-11T05:58:31Z

Same. The game turns into a slideshow near a mangrove swamp. In every other biome I'm getting pretty constant 80-100 fps but in mangrove swamps it drops to less than 15, and that's while loading preexisting chunks.

The same issue is present in Jungles and crimson forests as well due to all the vines, but to a lesser extent.

migrated 2022-11-16T05:18:03Z

Interesting thing I noticed, is that the issue doesn't appear to be as bad in 22w45a compared to 1.19.2. Made sure all video settings are identical in both installs, including render distance of 24 chunks; and no mods. I attached two screenshots from the same single-biome world. Can't say for sure that the issue is completely fixed, but it's definitely an improvement.

[Mod]Les3awe 2022-12-02T13:00:40Z

Much improved in 1.19.3-rc1.

[media]

syarumi 2022-12-14T04:32:43Z

Not entirely sure if i can say this is fixed. It might have been mitigated on some devices (NVIDIA maybe?) but on my case there isn't any noticeable difference from 1.19.2. I have to say though, that due how the game underperforms on my machine this might not be the case for others. Still, i think it's absurd how badly this biome performs compared to jungles (which are also laggy).

1.19.2 & 1.19.3, no entities, random tick disabled:

[media]

Same scene with jungle/forest biome as comparison, you can see it still performs bad but not as terrible as a mangrove swamp:

[media]

I want to note that this is when not moving and random tick disabled, however this report mentions the FPS drop is when moving around this biome, so the issue other players were experiencing might've been related to lighting or block updates mentioned in previous comments and not exactly about the rendering of mangrove roots/leaves (which i think are the main cause). Not sure if it's worth making a new report.

Stridey 2023-05-19T16:50:35Z

likely related to MC-262689

migrated 2023-11-04T12:59:53Z

Some mangrove leaves are decaying and some vines are destroyed because they are not connected to others.

Mr_Quasi 2023-11-09T12:00:23Z

Present in 23w45a

Fireswamped 2024-08-24T02:18:05Z

Mostly seems to do with "minecraft:noise" cause using custom noise dramatically decreases problem.
Altering noise and altering "foliage_color", "water_color", "water_fog_color". Completely removes so performance drop is equivalent to regular swamp.

Nathan Adams 2026-10-27T12:13:37Z

Thank you for your report!
We suspect that this does not occur in the latest version of Minecraft.

Is this issue present in the latest version of Minecraft?

_{This issue is being temporarily resolved as}_{Awaiting Response}_{. Once the requested information has been delivered, the report will be reopened automatically.}

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[Mod]Les3awe 2026-10-27T15:15:18Z

It has been confirmed that the FPS/TPS lag issue has been significantly improved in version 26.4 Snapshot 5 by adjusting the “Graphics API: Prefer Vulkan” and “Prefer DXGI Present: ON” settings in the "Video Settings".