IDM download speed is very slow. What can cause this problem? How can I fix it?

First please note that IDM shows download speed in Bytes per second and some providers write their bandwidth in Bits per second. One Byte is 8 Bits so download speed in IDM may be 8 times less than reported connection bandwidth.

Then please check that "Downloads→Speed Limiter→Turn off" IDM main menu item is enabled. Speed limiter feature limits IDM speed to some preset value.

Turn off speed limiter

Such problems may also occur if you use a FireWall on your computer. Please read instructions how to solve problems with FireWalls.

Please note that your download speed strongly depends on:

  • A site you are downloading from.
  • The time of the day you are downloading at.
  • Other Internet applications that download from the Internet at the same time.
  • Performance of your Internet connection.
  • Your Internet service provider (ISP).

To increase your speed:

1. Try to close other applications which may download at the same time.

2. Try to download from a mirror site.

3. Check your IDM connection settings:

3.1. If you are on a broadband connection, please try to select a high bandwidth connection type in "Options→Connection" dialog. You should try to increase "Default max. conn. number" on the same dialog (arrow 2 on the image). Try to set "Default max. conn. number" to 16 or 32. Also you may need to select a faster connection type at the same dialog (arrow 1 on the image). IDM does not open new connections if set connection speed is already reached.

3.2. If you are using Dial-Up, try to set a lower number of simultaneous connections in IDM options (Default max. conn. number). Try to set it to 1 or 2 (arrow 2 on the image).

Set number of simultaneous connections for dial-up connection type

4. Try to schedule downloads and download at a night time.

5. Don't forget to check with your ISP your bandwidth limits and download speeds.