Like all hostile mobs they will fill up the mob cap, after the mob cap is filled the spawn rate is nearly zero.
As long as the mob cap isn't full other mobs shouldn't affect how fast slimes spawn in your spawner, but that probably isn't what you meant. ;-)
So technically the answer is no but for all practical purposes it's yes, you should stop ALL (or as close as you can get) hostile mob spawning outside your mob farm within 128 blocks of your position. That's a 256 block diameter sphere.
(You, of course, want to stop all hostile mob spawning altogether, in multiplayer you don't have much control over mob spawning near other players, in single player 128 blocks around you is all you have to worry about. )
I feel like everyone is having issues with slime farms lately, weird
This may have to do with a change in 1.14 that made all blocks, transparent or otherwise, affect the height range used when spawning mobs; that is, the game chooses a random y-coordinate up to the top of the highest block, so the spawn rate per layer will decrease as it gets higher (y=1 = 1/1 chance per tick; y=256 = 1/256 chance per tick). Previously, this was based on blocks that blocked light (1.14 introduced additional height maps where before there was just one, mainly used by light), so you could put glass over a slime farm and it wouldn't affect spawn rates (which also did not work prior to 1.8 since the game used the height of the highest loaded chunk section, so the mechanics in 1.14 are actually more like what the game used to have, except individual blocks are considered, not whole chunks):
Despite the title this affects mob spawning in general but is much more noticeable with slimes due to their low spawn probability, 1/10 of that of other common hostile mobs (1/2 at the surface in swamps).
Hopefully title explains it but just in case it doesn't - I'll try to explain
First, some background
My 'base' covers a 7x7 chunk area
within my base area I cleared out underground (diamond level) the whole area & found several chunks that spawn slimes
Within the 7x7 area
There is a 3 chunk x 1 chunk that spawns slimes
There are 3 separate 1 chunk x 1 chunks scattered around the area
There is a 2x1 slime chunks
Hopefully this will show the layout (S = spawn chunk / X = Normal chunk)
X X X X X S X
S S S X X X X
X X X X X X X
X X X X X X X
S X X X X X X
X X X X S X X
S S X X X X X
I'm building a slime farm in the 3 x 1 chunk area - about 6 levels high
(I will also try to light up surround caves etc)
My question is - Would slimes spawning in any of the OTHER slime chunks affect the spawn rates in the 3x1 area
If so - I plan to halfslab the other areas to prevent slime spawn
Thanx in advance
Like all hostile mobs they will fill up the mob cap, after the mob cap is filled the spawn rate is nearly zero.
As long as the mob cap isn't full other mobs shouldn't affect how fast slimes spawn in your spawner, but that probably isn't what you meant. ;-)
So technically the answer is no but for all practical purposes it's yes, you should stop ALL (or as close as you can get) hostile mob spawning outside your mob farm within 128 blocks of your position. That's a 256 block diameter sphere.
(You, of course, want to stop all hostile mob spawning altogether, in multiplayer you don't have much control over mob spawning near other players, in single player 128 blocks around you is all you have to worry about. )
Just testing.
I feel like everyone is having issues with slime farms lately, weird
This may have to do with a change in 1.14 that made all blocks, transparent or otherwise, affect the height range used when spawning mobs; that is, the game chooses a random y-coordinate up to the top of the highest block, so the spawn rate per layer will decrease as it gets higher (y=1 = 1/1 chance per tick; y=256 = 1/256 chance per tick). Previously, this was based on blocks that blocked light (1.14 introduced additional height maps where before there was just one, mainly used by light), so you could put glass over a slime farm and it wouldn't affect spawn rates (which also did not work prior to 1.8 since the game used the height of the highest loaded chunk section, so the mechanics in 1.14 are actually more like what the game used to have, except individual blocks are considered, not whole chunks):
MC-153326 Slimes spawn less frequently if there are any blocks above their spawning spaces
Despite the title this affects mob spawning in general but is much more noticeable with slimes due to their low spawn probability, 1/10 of that of other common hostile mobs (1/2 at the surface in swamps).
TheMasterCaver's First World - possibly the most caved-out world in Minecraft history - includes world download.
TheMasterCaver's World - my own version of Minecraft largely based on my views of how the game should have evolved since 1.6.4.
Why do I still play in 1.6.4?