The bug
When using flint and steel for deforestation, the game performance worsens until is unplayable.
How to reproduce
Go to a forest, light it on fire, wait for the fire to spread.
Examples
[media][media]
Related issues
is duplicated by
Attachments
Comments
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I'm afraid this is not a bug, this is lag due to a lot of fire needing to be processed on your PC, just like igniting a ton of TNT at the same time.
galaxy_2alex
I can confirm this for 1.14-pre1, and 1.13.2 as well - 1.12.2 performs much smoother when there is a large fire. Added two screenshots, one on 1.14-pre1 on a Buffet Dark Forest set on fire, the other one 1.12.2 with a customised Dark Forest only world set on fire, With the F3-Shift screen turned on, going down to the thing that seems to cause the most lag (root.gameRenderer.level.terrain_setup.rebuildNear).
Edit: I do realise that my 1.14 is running on Java 12 (running quite well actually) - I also tested it on the bundled Java with the same result.
ZeNico13
Still in all 1.14 Pre-Releases
ZeNico13
Still in 1.14 Release
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It was easier to have a tree lit on fire and have the game run smoothly pre-1.14. Now it lags too much.
ZeNico13
Still in 1.14.1 Release
ZeNico13
Still in 1.14.2 Pre-Release 1 and 1.14.2 Pre-Release 2
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Still in 1.14.3 Pre-Release 2.
ZeNico13
Still in 19w45a and 19w45b.
[media]
slicedlime
What is your biome blend setting?
ZeNico13
@slicedlime The biome blend is at its default setting (5x5).
slicedlime
Thanks. Could you post another screenshot like the previous one - with the performance graph, on 19w46a or later please?
ZeNico13
@slicedlime Here there are!
[media][media]
rubinos
@slicedlime Just wanted to add some screenshots on a different system setup.
Biome blend= 3x3 on both versions.
Just to clarify, these are not very trustworthy because at some point being a block or two nearer the fire provokes a HUGE performance drop. I can elaborate more on this if needed.
[media][media]
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Affects 20w12a
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Affects 1.16 pre release 2
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Can confirm for 1.16 pre release 5
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still happens in 20w27a
Sonicwave
Reporter changed to @unknown upon request in Discord, since the original reporter has been inactive.
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Why did you light this poor forest on fire in the first place?
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It might not be caused by purposely lighting it on fire, it could also be caused by a lava lake.
ampolive
Can confirm in 1.17.1. Doesn't even need to be a large forest; a few burning trees are enough to cause frame rate issues.
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That's worse in 21w39a
ampolive
Can confirm in 21w40a.
Moesh
This issue was fixed, but keeps being reopened. The amount of lag has been reduced by a drastic amount to when this was first introduced. This one must stay closed.
ampolive
I have created a new ticket for the post-19w45a issue: MC-240450.
[Mod] markderickson