Overworld Speedup
What It Does
This adds a speed multiplier to the overworld callback with four levels: 1x, 2x, 4x, and 8x, using VAR_OVERWORLD_SPEEDUP. The speedup runs additional calls of AnimateSprites(), CameraUpdate(), and UpdateCameraPanning() within OverworldBasic(), resulting in 0, 1, 3, or 7 extra iterations. Collision detection, script execution, and input handling are not re-run, so other game logic should stays consistent while movement and animations run faster.
The speedup can be disabled on the fly by holding R, or blocked entirely with FLAG_PREVENT_OVERWORLD_SPEEDUP, useful for cutscenes or specific areas where running at full speed would break something.
How It’s Implemented
The main logic lives in CB2_Overworld() within overworld.c. Both the FLAG and VAR constants are set to 0 as placeholders, and they need to be assigned ‘real’ values from flags.h and vars.h.
A note from testing: the difference between 8x and 16x is not noticeably meaningful, and 32x starts to produce visible performance issues, so 8x is a reasonable ceiling for the speed levels.
Installation
The diff for this feature can be used to add these changes. A full step-by-step tutorial is also available on the Team Aqua’s Asset Repo wiki, which covers porting to pret/pokefirered and RHH/pokeemerald-expansion as well.
Why It’s In Ikigai
When playing on an emulator, players tend to use speedup. In games with custom music, such as Pokémon Ikigai, emulator speedup will cause it to be inaudible, or players may even breeze past important story elements. Adding a controllable speedup option, even just 2x makes a noticeable difference to how the game feels to navigate without making it feel out of control.