Why a long delay after command not found?

after some research I have found this:

• try to uninstall the command-not-found package with $>yum remove command-not-found then install it again with >$yum install command-not-found (just in case you have that package installed on your system).

if that doesn't help try:

• add this to your ~/.bashrc file:

  unset command_not_found_handle

I found that the best solution, at least on Fedora, is to modify the configuration file
/etc/PackageKit/CommandNotFound.conf

as the biggest delay comes from the search for packages to install, if you modify SoftwareSourceSearch=true in SoftwareSourceSearch=false

the delay is almost 0 and you still get warned about misspellings, which can be useful.

Fedora uses something similar.

If you want to just remove this feature use:

yum remove PackageKit-command-not-found