CLAUDE_CODE_SCROLL_SPEED

Updated October 23, 2026 by Alex Sorokoletov

CLAUDE_CODE_SCROLL_SPEED is a Claude Code environment variable: Controls the scroll speed within the terminal UI. Default scroll behavior in terminal applications is typically one line per scroll event, which can feel sluggish when reviewing long tool outputs or code diffs. Removed in v2.1.310, so current releases ignore it. It is listed in the official reference.

How to set it

For one session, export it in the shell that starts Claude Code:

export CLAUDE_CODE_SCROLL_SPEED=<value>
claude

To apply it to every session, add it to the env object of a settings file:

// ~/.claude/settings.json
{
  "env": {
    "CLAUDE_CODE_SCROLL_SPEED": "<value>"
  }
}

Release notes that mention it

• Claude Code v2.1.88 — 7 New Environment Variables: Mouse Control, REPL Mode, and Flicker-Free Rendering
• Claude Code Version Tracker: Undocumented Env Vars, Feature Gates & Models

Related variables

• CLAUDE_CODE_DISABLE_VIRTUAL_SCROLL: Disable virtual scrolling in terminal UI.
• CLAUDE_CODE_SCROLL_SPEEDI
• CLAUDE_CODE_SCROLL_SPEEDI30
• CLAUDE_AX_PREPARK_MS
• CLAUDE_AX_SCREEN_READER
• CLAUDE_AX_STARTUP_QUIET_MS: Startup quiet window (milliseconds) for screen-reader mode.
• CLAUDE_CODE_ACCESSIBILITY: Enable accessibility mode; disables cursor hiding.
• CLAUDE_CODE_ALT_SCREEN_FULL_REPAINT

Frequently asked questions

All variables, searchable: Claude Code environment variables.