Scheme 48 Manual | Contents | In Chapter: User's guide
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## Performance

If you want to generally have your code run faster than it normally would, enter `inline-values` mode before loading anything. Otherwise calls to primitives (like `+` and `cons`) and in-line procedures (like `not` and `cadr`) won't be open-coded, and programs will run more slowly.

The system doesn't start in `inline-values` mode by default because the Scheme report permits redefinitions of built-in procedures. With this mode set, such redefinitions don't work according to the report, because previously compiled calls may have in-lined the old definition, leaving no opportunity to call the new definition.

`Inline-values` mode is controlled by the `inline-values` switch. `,set inline-values` and `,unset inline-values` turn it on and off.

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