Version 1.12.2 has a large hysteresis when placed on an automatic sieve

Can't reproduce. It's most likely something else in your chunk slowing down the chunk rebuild or general TPS issues. If there is an actual performance issue I need more info.

When the auto sieve on the ground, the right click occurs when the situation as shown above

Heavy auto sieve also have this problem

Can you check if it still happens when skipAutoSieveSkins in the config file is set to true?

Then I really can't see how this would be caused by Ex Compressum. Is it maybe related to what's placed down nearby? Have you tried on a new world?

Anyway, there is this problem

20:46:06] [Server thread/WARN]: Couldn't look up profile properties for com.mojang.authlib.GameProfile@34c0a5b8[id=53909932-f794-33c0-9329-948045a4c1ce,name=steve,properties={},legacy=false] com.mojang.authlib.exceptions.AuthenticationException: No such UUID. at com.mojang.authlib.yggdrasil.YggdrasilAuthenticationService.makeRequest(YggdrasilAuthenticationService.java:79) ~[YggdrasilAuthenticationService.class:?] at com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService.fillGameProfile(YggdrasilMinecraftSessionService.java:180) [YggdrasilMinecraftSessionService.class:?] at com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService.fillProfileProperties(YggdrasilMinecraftSessionService.java:173) [YggdrasilMinecraftSessionService.class:?] at net.blay09.mods.excompressum.tile.TileAutoSieveBase.grabProfile(TileAutoSieveBase.java:373) [TileAutoSieveBase.class:?] at net.blay09.mods.excompressum.tile.TileAutoSieveBase.setCustomSkin(TileAutoSieveBase.java:355) [TileAutoSieveBase.class:?] at net.blay09.mods.excompressum.block.BlockAutoSieveBase.func_180633_a(BlockAutoSieveBase.java:202) [BlockAutoSieveBase.class:?] at net.blay09.mods.excompressum.block.BlockAutoSieve.func_180633_a(BlockAutoSieve.java:44) [BlockAutoSieve.class:?] at net.minecraft.item.ItemBlock.placeBlockAt(ItemBlock.java:186) [ahb.class:?] at net.minecraft.item.ItemBlock.func_180614_a(ItemBlock.java:54) [ahb.class:?] at net.minecraftforge.common.ForgeHooks.onPlaceItemIntoWorld(ForgeHooks.java:851) [ForgeHooks.class:?] at net.minecraft.item.ItemStack.func_179546_a(ItemStack.java:186) [aip.class:?] at net.minecraft.server.management.PlayerInteractionManager.func_187251_a(PlayerInteractionManager.java:478) [or.class:?] at net.minecraft.network.NetHandlerPlayServer.func_184337_a(NetHandlerPlayServer.java:739) [pa.class:?] at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.func_148833_a(SourceFile:55) [ma.class:?] at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.func_148833_a(SourceFile:11) [ma.class:?] at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) [hv$1.class:?] at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_131] at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_131] at net.minecraft.util.Util.func_181617_a(SourceFile:46) [h.class:?] at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:721) [MinecraftServer.class:?] at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:666) [MinecraftServer.class:?] at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:239) [chd.class:?] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:524) [MinecraftServer.class:?] at java.lang.Thread.run(Unknown Source) [?:1.8.0_131] [20:46:06] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 2487ms behind, skipping 49 tick(s)

The log helped. Please try this version which should hopefully fix the issue.