As of snapshot 21w10a, the game renderer has been updated to use newer OpenGL features. For some users, this may result in a loss in client-side performance (FPS). To gauge the impact of this, standard information is requested from affected users. Please follow the instructions below, and leave a comment with the results, as well as details about your system information.

The previous bug report about this (MC-219639) was used to gauge the performance impact in the snapshot phase. This one exists as a way to have comparable benchmarks between 1.16.5 and 1.17.x, which would not be possible with the previous bug report since extended world height has been disabled for 1.17.

• Download the attached world file Performance Test-2.zip, and extract the world into your saves folder
• Open the game in version 1.16.5
  • Ensure the default amount of RAM is allocated (1GB 32 bit users, 2GB 64 bit users)
  • Be sure to use the default Java runtime (Java 8 for Minecraft 1.16.5, Java 16 for Minecraft 1.17)
• Use the following standard video settings:

  FOV: Normal (70)
  Fullscreen: ON
  Fullscreen Resolution: 1280*720@60
  Biome Blend: 5x5 (Normal)
  Graphics: Fancy
  Render Distance: 12 chunks
  Smooth Lighting: Maximum
  Max Framerate: Unlimited
  VSync: OFF
  Clouds: Fancy
  Particles: ALL
  Mipmap Levels: 4
  Entity Distance: 100%
  

• Open the Performance Test world, and wait for the chunks to load (you may need to move your mouse).
  • If for whatever reason you need to re-create the world, please use the in-game "re-create" option to preserve the seed and game rules
• Reset your position:

  /execute in minecraft:overworld run tp @s 188.76 98.90 -209.60 179.85 35.10

• Change your game mode to spectator:

  /gamemode spectator

• Open the F3 debug menu, and wait a minute for the FPS to stabilize
• Note down your average FPS
• Repeat these steps in 1.17.x
  • Here, also press F3 + L to generate a profiling report (while generating the profiling report, disable the F3 screen)
• Leave a comment on this bug report with:

  FPS in 1.16.5
  FPS in 1.17.x (please specify the exact version)
  Your operating system
  Your CPU
  Your Graphics card and driver version, as reported by the game
  Your profiling zip file
  

See here for an example comment.