Neverimnd figured it out, aparantly Damage Indicators mod was causing this.
Edit: Jesus Christ, I checked the option "alternative rendering" in the mod settings UI in game, and it now works without that lag!
Any help please?
I have these mods installed
:
CodeChickenCore{1.0.5.36} [CodeChicken Core] (minecraft.jar)
UCH NotEnoughItems{1.0.5.104} [Not Enough Items] (NotEnoughItems-1.8-1.0.5.104-universal.jar)
UCH itemphysic{1.1.2} [itemPhysic] (minecraft.jar)
UCH AnimalsPlus{1.6} [Animals Plus] (AnimalsPlus-1.6.jar)
UCH wuppy29_slimedungeon{1.6.3} [slime Dungeons] (Better Dungeons Mod 1.8.jar)
UCH BetterSprinting{1.1.1} [better Sprinting] (BetterSprinting MC-1.8 v1.1.1.jar)
UCH Bloodmoon{1.0} [bloodmoon] (Blood-Moon-Mod-1.8.jar)
UCH speedytoolsmod{3.0.0} [build Faster Mod] (BuildFaster-3-0-0-Minecraft-1-8 (1).zip)
UCH craftablehorsearmour{1.0} [Craftable Horse Armour [CHA&S]] (Craftable Horse Armour and Saddle 1.2.1.jar)
UCH customnpcs{1.8.0} [CustomNPCs] (CustomNPCs_1.8.0(09jan16).jar)
UCH wonderfulwands{1.7.2} [Wonderful Wands] (CyanosWonderfulWands_1.8-1.7.2.jar)
UCH DamageIndicatorsMod{3.3.2} [Damage Indicators] (Damage-Indicators-Mod-1.8.jar)
UCH dldungeonsjdg{1.8.7b} [Doomlike Dungeons] (Doomlike-Dungeons-Mod-1.8.jar)
UCH samsprojectiles{1.8-1.2.1} [Ender Projectiles] (Ender-Projectiles-Mod-1.8.jar)
UCH sonicvisuals{0.4} [Enhanced Visuals] (Enhanced-Visuals-Mod-1.8.jar)
UCH InfernalMobs{1.6.0} [infernal Mobs] (Infernal-Mobs-Mod-1.8.zip)
UCH fyberbackpack{1.0} [Just Backpacks] (Just-Backpacks-Mod-1.8.jar)
UCH levelup{0.11} [Level Up!] (Level-Up-Mod-1.8.jar)
UCH RadixCore{1.8-2.1.0} [RadixCore] (RadixCore-1.8-2.1.0-universal.jar)
UCH MCA{1.8-5.1.1.1} [Minecraft Comes Alive] (MCA-1.8-5.1.1.1-universal.jar)
UCH enderpeople{0.2} [Much More Enderman] (More-Enderman-Mod-1.8.jar)
UCH moreplayermodels{1.8.0_beta} [MorePlayerModels] (More-Player-Models-2-Mod-1.8.jar)
UCH me{1.3.2.1} [More Enchantments] (MoreEnchantments-1.8-1.3.2.1.jar)
UCH AencEx{0.0.1} [AencEx] (MoreEnchantments-1.8-1.3.2.1.jar)
UCH samsmountedpearl{1.8-1.0.0} [Mounted Pearl] (MountedPearl-1.8-1.0.0.jar)
UCH PlansAPI{4.0.4} [Plans API] (Plans-API-1.8.jar)
UCH quickhotbar{1.03} [Quick Hotbar] (quickhotbar_18_1.03.jar)
UCH Roguelike{1.3.6} [Roguelike Dungeons] (Roguelike-Dungeons-Mod-1.8.jar)
UCH AS_Ruins{14.4} [Ruins Spawning System] (Ruins-1.8.jar)
UCH Sleep{0.0-1} [sleep] (Sleep-Mod-1.8.jar)
UCH SmartCursor{1.5.0} [smartCursor] (SmartCursor-Mod-1.8.jar)