# Ofast

Sets certain aggressive options to improve the speed of your application.

## Syntax

Linux: | -Ofast

macOS: | -Ofast

Windows: | None

## Arguments

None

## Default

OFF | The aggressive optimizations that improve speed are not enabled.

## Description

This option improves the speed of your application.

It sets compiler options -O3, -no-prec-div, and -fp-model fast=2.

On Linux* systems, this option is provided for compatibility with gcc.

## IDE Equivalent

None

## Alternate Options

None

Parent topic: Optimization Options

## See Also

O compiler option
prec-div, Qprec-div compiler option
fast compiler option
fp-model, fp compiler option