I’m playing on PC using an Intel Core i7 13700k, an RTX 4070 and 32GB DDR5 RAM (8GB allocated to Minecraft) and this regression in performance has also been impacting me as well. It started during 1.21.5 (it doesn’t happen in 1.21.4) but every version subsequent to 1.21.5, snapshots included, all the way up until the latest release as of July 19th, 2025 (1.21.8) have been significantly laggier, slower and sluggish especially when using shaders (my GPU usage stays between 93% and 100%).
I tested some stuff out with some controlled variables. I should mention I used the exact same mods and shaders I used on 1.21.4 for 1.21.5, 1.21.6, 1.21.7, and 1.21.8. Even when I’m not using shaders, my GPU usage is hovering anywhere from 70% to 90% on vanilla Minecraft with no mods and no shaders on 1.21.5 and above.
Using the same seed and teleporting to the same precise coordinates in that world, I’m obtaining approximately 150fps at the highest shader settings on Minecraft with mods in 1.21.4 (render distance set to 16 chunks, simulation distance set to 12 chunks and shadow distance set to 8). With all variables maintained exactly the same except for version of Minecraft, I tried the same thing on all versions including and after 1.21.5. I observed a drop in performance that ranged anywhere from 26% to 40% using the same settings, mods, shaders, etc.
I hope this helps the devs and engineers resolve the issue. I’m using the latest NVDIA drivers as of July 19th, 2025 and the latest version of Windows 11.
Sebastian Larranaga
I’m playing on PC using an Intel Core i7 13700k, an RTX 4070 and 32GB DDR5 RAM (8GB allocated to Minecraft) and this regression in performance has also been impacting me as well. It started during 1.21.5 (it doesn’t happen in 1.21.4) but every version subsequent to 1.21.5, snapshots included, all the way up until the latest release as of July 19th, 2025 (1.21.8) have been significantly laggier, slower and sluggish especially when using shaders (my GPU usage stays between 93% and 100%).
I tested some stuff out with some controlled variables. I should mention I used the exact same mods and shaders I used on 1.21.4 for 1.21.5, 1.21.6, 1.21.7, and 1.21.8. Even when I’m not using shaders, my GPU usage is hovering anywhere from 70% to 90% on vanilla Minecraft with no mods and no shaders on 1.21.5 and above.
Using the same seed and teleporting to the same precise coordinates in that world, I’m obtaining approximately 150fps at the highest shader settings on Minecraft with mods in 1.21.4 (render distance set to 16 chunks, simulation distance set to 12 chunks and shadow distance set to 8). With all variables maintained exactly the same except for version of Minecraft, I tried the same thing on all versions including and after 1.21.5. I observed a drop in performance that ranged anywhere from 26% to 40% using the same settings, mods, shaders, etc.
I hope this helps the devs and engineers resolve the issue. I’m using the latest NVDIA drivers as of July 19th, 2025 and the latest version of Windows 11.